I tried to change to a smaller fee last time and the amount received on the other end was still exactly 10% less.
This shouldn't be an issue since Electrum will not deduct the fee from the output's amount, except if you've replaced it via rbf (
"increase fee" option) and selected the option to do so.
I'm depositing onto a poker site. I've been doing this for over 2 years and never before got charged, this just started happening recently and I'm not sure why. Live support from the site keeps telling me there's nothing wrong on their end and they credit the full amount they receive from me. Not sure what else to do.
In that case, check the transactions in your Electrum's history tab (
Right-click->View Transaction).
And see if the output (
your poker site deposit address) has the same amount as what they've credited you.
If not the same, then they are either lying about the amount being deposited or there's an issue with their site.
If it's the same, then there's "
something" wrong with your Electrum or setting (
but definitely not a hack since the funds would've been wiped if so).