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Trying to edit FireRed to make grass encounters more diverse, using Advance Map 1.95. Route 1 should have pidgeys, rattatas, spearows, eevee, pikachus and electrike. Testing shows that for some reason i'm also getting wingulls (probably in electrikes' place, since i haven't seem them, but that might be RNG screwing with me).
Likewise, Route 22 spawns Taillow (apparently in place of Aron).
Are there some unspoken rules (other than "make 4% and 1% spawns match, there are no cases in the game when they would differ", which i've figured out/guessed and fixed but that didn't fix the wingulls)? I know Advance Map has a reputation for being bugged, but i haven't seen a list of known bugs-to-be-considered.