My norm is to start a tab as I find it cheaper (tipping 20% at the end of the night on a big bill is cheaper than tipping $3 for every 7.50 beer). I have never been aware of a pre auth regardless of bar, pub, etc.
There have been numerous times I have received an invoice showing more than what I really had but have never had a bar tender "alter" the receipt after..... either way, I wouldnt worry if I was you. Give it a few days and if nothing changes, it will take 5 minutes of your time and a call to your CC company to correct the issue. You can then take it a step further and inquire directly with the bar to ensure they get to the bottom of it!
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