What am I doing wrong with building?

Hi guys!
No idea if its a bug so i put it here for now.
I started playing only recently as i think game got far enough to be fun but i have no clue why my buildings never get build. They are quite simple so i they should be easily done.
Some pictures.


It looks like they cant finish the roof but i have no clue why?

Ok ok maybe i panicked a bit too much but i got it figured out now i think couse i managed to build a new one exactly the same.

Looks like if you edit the building/pause it or do any amendments at all the building work will stop with no way to resume the work

the edit button should have been greyed out if you had already started construction of the building. was this not the case in your situation or did you amend the building another way?