Leaking tap after seat recutting
If they aren't hexed holes then they aren't replaceable, you might have to put a hex bit in to confirm removability. It sounds like you removed too much. If the seats were scratched, pitted or therefore defective, then you should've put new good ones in instead, if possible or returned the taps. But, you shouldn't touch the seats unless or until they leak &amp; if you do it should just be a light few turn honing.

If the seats started out like most seats, being proud or raised from the shoulder, but are now flat or even with the shoulder. Then, you took way too much off. Only the seat is your seal, not the entire shoulder. You'll either need to get new seats, if they remove. Or, have to go to thicker washers. Or, get new taps with replaceable seats &amp; not touch the included seats.