I'm using 8 way movement which is probably the reason it can happen at all but at this point I'd obviously not want to remove that. Most of the warps are scrolling warps but a few are insta-warps for where a scrolling warp would not work. The one in question was most definitely a scrolling warp though.
Getting back to revamping things, I suspect the waterfall dungeon I made will probably get an overhaul sometime this week. Not entirely sure what I'm going to do with it yet, but I hope to have something equal to the quality of Guidance Gate and Eternal Corridor.