I encountered an issue when trying to delete an AnimNotify inside an Animation Montage.
I have two sections. Each section has the same AnimNotifies. When I try to delete the one on the right, it instead deletes the one on the left of the same name.
It happens with every notify that is more than once in the Montage Notifies section.
If I try to delete the EndFistPunch on the right, EndFistPunch on the left will be deleted instead.
I’m entering a bug report which I will add to this post. In the meantime, as a workaround, I’ve found if you drag the one you want to delete to the left of the others and then delete it, it works without deleting anything else. A little “wonky,” but should get you by until this bug is fixed.