Ok there are two issues here - one is that your cell border is set to -1, this effectively shrinks your solid walls to basically nothing since your cell size is larger than your wall size. Try setting this to 0, and lowering your cell size to 16 or so.
Problem two is the slow rotate speed - This will cause your object to float around corners and cut through what should be solid walls. This is amplified by the fact that you are updating your path every second. If the pathfinding has to turn around or pick a new route, then your object has to slowly rotate and turn around. You can increase this to 1000 or 2000 for a tighter turn.
Remember the solid behavior doesn't affect the movement portion of the pathfinding behavior, only the pathfinding part of it. So as your object was trying to get back on the path, with a slow rotation speed, it would go ahead and go through solid walls. Also with the cell border set to -1, there were basically no solids at all on your layout as far as the pathfinding behavior is concerned.
If you're making a pacman type game, I suggest building your levels and walls with standard tile sizes, things will run much more smoothly.