Beehaw is known for being way too heavy handed in moderation, though it hasn't been too much of a problem because they decided to defederate from the large instances, which really killed the majority of the network effect they originally had in the fediverse.
Honestly I'd just recommend staying away from them, they're not a bad instance but you will encounter and deal with a lot of petty shit like this in their communities.
Do you mean instance bans or in lemmy.world communities? If it's community bans that's different since those are often not affiliated with the instance admins. Beehaw though has not community mods, everything is completely and tightly controlled by their admin team, which makes their transgressions so much worse and reflect on them as an instance, and not just one community, or one moderator.