Walls breaking without touching them on casual

Have anyone else experienced this? Sometimes when I start turn in a casual game certain walls appears broken. When I look at the battle screen, there are no attacks there.

Yup, has happend to me on a few ocassions.

Like this one...



this wall was linked in the bottom but broke out...

From what I experienced if u save and leave and come back to make more move some moves will be fucked up