Not all BTC transferred between my wallets made it

Hey everyone, about an hour ago I sent some BTC and totally messed up. I thought I was sending .0093776 BTC, but my Electrum wallet was actually asking for mBTC. So, I ended up sending .00938 mBTC instead, thinking it was just a simple transfer. Turns out, I sent .0093776 BTC, which is about 15.76 mBTC, but only got 9.40144 mBTC back. All of my BTC from the original wallet got sent over, and I only received around 59% of the BTC I tried to send to my Electrum wallet. I’m here to find out if there's any chance I can get those missing BTC back. I looked into contacting Electrum support and found this email to reach out for help. Any assistance would really mean a lot to me, since that’s like $223.77 USD worth of BTC that I lost in this whole mess. If you know a better way to submit my ticket or if you have any tips, I’d really appreciate it. Thanks for taking the time to read this, hope to hear from you soon. Here's the transaction ID for reference: 1dad55f339301e2e5e50089f28010af0921b659a99dcd20b0bb264dfbe01d702

The transactionid you posted is from some kind of online wallet or exchange, right? Not a desktop wallet or something? It uses an input of >22 BTC and creates 10 outputs. So, if you used an online service and you did not receive the correct amount, i guess you'll have to contact their support? https://blockstream.info/tx/1dad55f339301e2e5e50089f28010af0921b659a99dcd20b0bb264dfbe01d702 If you mistakingly shared the wrong txid, your story sounds like a change address... But i don't think that's the case for the txid you posted...

Your whole narration is a little still blurry to me and my reason is simple. I looked up your transaction on a Blockchain explorer and the details I found there is different from what you are saying over here. The transaction has over 20BTC. It has 1 input of course meaning one of your child addresses had enough funds to pay for the transaction and to my suprise I can see about 9 outputs. This is the input address with 20BTC I think this address has the transaction of about $200 that you are referring to. The others you saw are change addresses that received them so the remaining balance minus your initial sent amount ($223.7) is what should be left in your wallet. The change addresses only give your transaction more privacy.

You received the btc in your Electrum wallet, right? In that case without telling the name of the wallet [sent wallet] no one can help you.

How do you get 3 different numbers here?

0.0093776 BTC is equal 9.3776 mBTC, where 1 BTC is equal 1000 mBTC. So assuming you actually enter 0.00940144 BTC on the withdraw request (i assume you withdraw from exchange or other service), you already received what you requested. FYI, there's no thing such as official Electrum support and nobody have ability to cancel/reverse Bitcoin transaction. Anyone who claim such things are scammer and should be blocked/ignored. Also be careful if you receive PM (private message) offering help, which is common tactics used by scammer.

Electrum isn't referring to an altcoin when it shows "mBTC" unit, it's not the same as "MBTC" coin. When searching for conversion tool, pay attention to the letter m's case, a milliBitcoin unit should be lowercase "mBTC", just a small denomination of Bitcoin (e.g.: BTC, mBTC, satoshi) Whilst the one with uppercase is an altcoin "MBTC"; "mStable Bitcoin" which 9.3 mBTC is roughly equals to the 15MBTC that you're expecting. As your statement says, you've sent 0.0093776 BTC to Electrum so, you received (close to) the same amount in Electrum. (sender even sent 2k sats more based from what you wrote) If you don't want to be confused on the unit, set it to display the common bitcoin unit "BTC" in Electrum settings: "Tools->Preferences->Units->Base Unit".

The SI prefix "M" stands for mega, which makes it millions of Bitcoins. As in: there can never be more than 21 MBTC. But the unit is too big, even for whales. How did OP go from Bitcoin to some shitcoin, and casually type that conversion as if it's a normal thing to do? Is this some sneaky shitcoin promotion?

Definitely an online wallet or an exchange unless OP does have at least 22 BTC. In a normal, non-custodial wallet, the software will have a list of change addresses lined up to receive the change from the transaction, or it will possibly just send the change back to the original address. So maybe it was burned up in transaction fees (or withdrawal fees), or there was a bug in the online wallet software.

It's fairly easy to tell that he may have accidentally "Googled" a Bitcoin-to-Altcoin pair when converting BTC to mBTC value by the amount that he's expecting... If it's the megaBitcoin that you mentioned, the conversion shouldn't stray away from the digit "9", while he's expecting to receive "15". That alone tells that there's market price subjected to the unit converter that he must have used. And if you check that altcoins' price (at that time) the equivalent value is the same as his expected amount. This is more credible than the theory of OP mistaking the 22BTC input as his and expected 15mBTC. He even clearly mentioned that he "sent .0093776 BTC to electrum". IMO, OP doesn't have that pattern and it takes quite an extensive investigation to get to same conclusion as mine.