Ultrawide is definitely not working as intended in Adr1ft. It's just not adding horizontal field of view, even with max fov (which by the way is extremely bugged in this game and will only expand the helmet's size instead of adding actual field of view). Proper ultrawide support necessarily means hor. scaling, otherwise it's a severely flawed implementation, morever if it can't be "fixed" with a higher fov like in this case. If you want to keep the page as is I think at least there should be a warning somewhere letting people know that the ultrawide resolutions are not working properly, and definitely not up to a "gold medal" standard.
Topic on User talk:Keith
I see. As far as I'm aware the Vert- is a common issue with UE4 games. Did you try the Hor+ scaling fix documented here and see if that alleviates the issue?