@Stefan ********
that makes ZERO sense, if you got stamped in on a 30 day visa exempt entry BUT you really were supposed to be stamped in for 90 days, when you went to correct it you wouldn't have been on overstay if they'd stamp you correctly ๐ so you shouldn't have been fined.
As a rule if you're "short stamped" <- stamped in for less time than you would get, as long as you correct it BEFORE your real stamp would run out you shouldn't get fined