Can't connect my profile

Your third screenshot has the answer in it. That last screen says the account is already connected and offers you Switch Account or request access from the owner. That isn't a bug, it's Meta telling you that Instagram account is already claimed by an existing connection.

An Instagram account can only be attached to one ManyChat workspace at a time. You've got two, Shannon H Polson and The Grit Institute, so shannonhpolson is almost certainly already connected inside the other one. When you try to add it here, Meta refuses and you end up with whichever account is still free, which is exactly why it looks like it's connecting to the wrong one.

You own both workspaces so you can fix this yourself without a ticket. Open the one that currently has shannonhpolson connected, disconnect Instagram there, then come back to this workspace and connect it. That access request you sent is going to yourself, so don't sit waiting on it.

Worth checking which Business Portfolio each account sits under while you're in there. You picked aborderlife on this attempt, which is a third name again, and that gets confusing fast when you're running several.

Unfortunately requesting to switch account spins, then very quickly cycles through an error/link of some sort. Then it comes back to the page of offering to switch. :(