[Question] Surfing in cave sand bug

[CrissKnife]

Hello, I'm just starting messing around with Pokemon Essentials and I'm making a desert map. I used Brown cave sand as my base but now every time I press A while I'm standing in it, the prompt for swimming comes up. What did I do wrong and/or how do I fix this. I did have to use an Autotile to get the cave sand tile into the Outside Tileset, could that have messed it up?

Also I tried to post to the Pokemon Essentials page but for some reason it just wouldn't let me. Every time is click the create post button is just comes back with a "Saving post failed" message.

 

[CrissKnife]

I guess I fixed it kinda but I definitely don't really understand the problem. When I replaced an Autotile in the Outside Tileset I replaced a Waterfall tile and I guess the properties of the waterfall tile transferred over to the sand tile. When I replaced the Autotile of Flowers, a tile you can obviously not swim on, to Brown cave sand I can't swim in my sand anymore. Seems super funky tho. Also literally as I'm writing this I'm going over some of the base game maps and I'm seeing that now all tiles that WERE flowers are not brown cave sand. It kinda seems like a long term fix would be to edit the tilesets in Gimp to include the tiles I want. Which I'm sure I'll get around to but ugh I definitely do not want to do that right now.