You have probably set the collission wrong. Go to the database, go to tilesets find the tile you are using for your wall and click on it until it shows an x. I might be wrong since i´m using mv instead of mz, but im pretty sure this is the same across the two versions.
It does sometimes get a little embarrassing that I often come here to ask for help with something and seldom have anything to actually show for it. If there is one thing though I can commend myself for, it's for sticking with an idea I've been tinkering with for this long now and gradually making headways. Even though I've been reserved about my progress, I can say I'm farther now than where I initially started.
Haven't been on here actively in awhile, project is going strong my biggest issue is the STORY, i'm refining the plot and learning so much i decided to take a writers class to improve even more but the programming and functionality of the game is stepping up nicely!