[Map] Tiles Displaying Improperly

[MobAcc]

So this is my map in FireRed: https://media.discordapp.net/attach...368230023199/Library_Revision_1_1st_Floot.jpg

But this is what it looks like in-game: https://media.discordapp.net/attachments/532011860820492298/586235372925616135/Wind_-_Copy_10.png

What is causing the tilesets to display wrong?

Check the black border tile. Perhaps it's the wrong one? Try the black from both primary and secondary tilesets