Dupes ignoring job priorities

From time to time my duplicates ignore their professional duties to do someone else's work that has a lower priority in their worksheet.
Particularly in this way cooks prefer to build objects with priority 9 or wear a slime with priority 7 instead of cooking with priority 9 and the highest priority among their works.

Funny but it's the main reason my colonies died.
Attached a save file in which cook prefer to build and mop instead of doing dinner when other colonists are starving. Directly under the printer=)

The Sticky Rat's Nest.sav