Platform object sundely doesn't interact with platforms

I have one object that now magically has ben broken or something like that because it falls ignoring platforms and falling and falling… I have removed the behaviour and added again, I have removed all my code, etc. Doesnt matter, it falls :astonished:

Other platform objects are well but this no, I will remove and make it again but still this should be solved.

EDIT: I know when it failed.
It happend when I removed a colission mask I added previously in order to use the default mask.

Is the problem solved?

Yes, it was my fault, I removed the coilsion mask but I thought removing it was going to use the default mask, after that I discovered the button for create the default mask.