Okay, now that i see this, it definitely looks like there's something wrong on Paxful's side of things.

You shouldn't be able to send the full amount of BTC in the first place, since paxful will need like 5% to pay the fees on your transaction, (atleast that's what happens always in my case. I'm always left with some arbitrary number like ~0.001 in dust. I've never had 0BTC on my account)

Which means that this transaction should've not even been possible in the first place, and is definitely some sort of internal tx...?

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OR, after you entered your password and clicked send; it said the "Cannot send out less than X, excluding Y fees.", which means a transaction was already initiated?
Perhaps there is some sort malware which immediately initiated a transaction after you filled out your transaction, and was the 0.0000546 BTC what was left over.

But what's not explained is why your balance afterwards isn't 0.0000546, but 0.

It's kind of far-fetched.

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