even if I suck at calculator.

it was happening.

I was being charged 1.3% each trade.

Yeah, I really believe you now. Especially since you've such a great grasp of mathematics and how mt gox takes commission.

when I noticed it I typed "25 minus 0.65%" into google.

the result was different than my logbook, it didn't make sense.

so i typed "25 minus 1.3%" and it matched.

I don't care if you believe me or not.

If Mt. Gox still has the CSV associated with my account I'll show you.

"25 minus 1.3%" gives you the wrong value, you need to type "25 minus 1.3% of 25". So if your story is true, it does not mean that mt gox was charging 1.3%. You just got your numbers wrong.

Honestly, the google thing looks like a bug. It should be able to calculate "25 minus 1.3%" correctly. So it isn't completely your fault.

Did your trades happen to be for 2 btc, because if so then your story checks out, the numbers are just wrong because of google.