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I made a transfer to Bittrex, took the whole day to confirm..on top of that I noticed that 0.0043778 were transferred to this address: 1K3UKJAug32tZvLnJpewAKQkxkBzb7Pqzy

Transaction: https://blockchain.info/tx/30cd1ce7776d59a91dfd4573b7537b0dee151671f184109842234dd8fae1dd22

I'm using Electrum 3.0 (2Fa) and this is the first I'm sending money from it.

I tried to figure this out..idk if this is miner's fee, Trustcoin fee, some hidden Bittrex fee, change address?? (which isn't mine), Virus??
I'm confused and a bit frustrated from this weekend  ???

It's probably a change address used by the wallet. Change addresses are what allows you to not only spend large chunks of Bitcoin at once. Unless your balance has decreased more than you expected it, you should be fine.

I should have received 0.27298966 BTC which is 0.27459522 BTC being sent minus the miner's fee, but there are 0.26861186 BTC in my balance on Bittrex.
Should I contact them?

0.27298966 - 0.26861186 = 0.0043778

The blockchain link you provided shows the net of the transaction was 0.0043778.

I suggest you look at the transactions in electrum, look for a receive address matching that displayed by blockchain.

There is an address is Electrum and it's matching that is displayed by blockchain, but idk what is that address and why that amount was sent to it

Sounds like you've got all your coins, just a matter of which buckets they are in. Make some test transactions and track what happens using the blockchain.info. What's a real bummer is that test transactions today cost several USD each....they used to be pennies...

It's called a change address. You can learn more here: https://en.bitcoin.it/wiki/Change

I highly suggest trying to learn more about how Bitcoin works, because it will help you from freaking out/making small mistakes.

Thanks for help!

The thing is I have no idea about that address..Bittrex gave me only one address for the TBC, which isn't that one, and the change addresses on my Electrum wallet doesn't include this one.

Due to the zillion unconfirmed transactions, the current average fee for any transfer seems to be at 0,004+ BTC, yes that's like close to 30$. Just found that out when I could only send max 0.025 with 0.004 fee of my 0,029 BTC. There you have it, with almost 200k unconfirmed transactions and growing by the day, the fees to get the transaction done fast have risen up. I guess that's the last time that I did a BTC transaction. The miners can take their fees and shove them, time to move transactions to alt coins only. No wonder most switched to BCH.

Edit: with this high fee the confirmations started happening within 10 minutes
check: https://blockchain.info/tx/c33a27bae2b3d6aeef4de1c99312e27cb0c1307b045345e1939b1c3072fea9f1

That is not anywhere near correct.

I did one yesterday with a $4USD fee and it was confirmed within an hour or two.

Still did not solve this...

Given that you have an Electrum "2FA" wallet... it cannot be a change address... as it went to a "1"-type address... and NOT a "3"-type address which is what you wallet is generating.

If it is indeed the "first" transaction from your wallet, I would have to guess that it is the TrustedCoin "prepaid" fee of 0.005 which got calculated wrong? ??? The fact that your "payment"... along with a bunch of other 0.005 and 0.002 payments (the 2 prepayment amounts for TrustedCoin) were then aggregated in this transaction (https://blockchain.info/tx-index/301659497) would tend to support my hypothesis.

If you click the blue shield in the bottom right corner of the wallet, it should tell you how many credits you have left... is it 99? Or a lower value? Maybe this is a slight glitch in the system where if you don't have enough to meet the payment amount selected and you have 0 credits... it just takes whatever it can?

In any case... you coins haven't been stolen or lost... they were used to prepay your TrustedCoin 2FA fees...