The Tile sets you need to set all the passabilties, Prioities etc... It's a right pain in the arse...
you will find if you just place the tile sets in without doing so, you can walk over everything... It took me about 2 hours to set it all up, and it's still ot perfect... It takes time but trust me it's worth it...
Look at other tile sets within the data base, you will see buttons runnibg down the right of the screen and you will see things like Priority and stuff, set each area one at a time and keep testing until you have it correct...
I keep finding small bugs in my own, pack, it's such a big tile set... Getting it perfect is hard...