Splash double pages seem to be broken, at least for some titles. Essentially pages are paired wrong, so the left page is on the right and the right page is on the left. So when a double page spread shows up in double page view mode the spread is broken.
Thank you so much for letting us know! We'll take a look and work on getting that resolved. If you ever find any more, please let us know, and we'll get those resolved.
I assume the "easy" way to solve it is to add a blank page right after the cover, thus shifting all pages to their right placements. Although that might involve reuploading each affected issue/volume, if they are each a single file in your backend.