Writing Medium Routine (Comedy) Jumps Queue on Dig

Nothing -- the queue was completely clear / empty. 

I was at home (Daisy Hovel) and grabbing the various dig locations in that little neighborhood while the second sim was getting ready for work. I queued up the 3-5 digs there in the neighborhood and checked on the other sim, and went back to watch her, saw she was making progress, and had only 2 left. So I clicked the computer to queue something for when she finished the digs. Picked to work on comedy skill.

She had one dig in progress (eg, down in the queue to work on, she was walking to it).  One dig queued. I queued the write comedy routine hoping that when she finished these two digs she'd go to the computer so I could go help him finish getting ready for work and maybe play a game or something in the last 2 hours before work.

I watched the 'write comedy routine' item pass the second dig and become the next action queued. So she would have finished the dig she was working on, gone to write a comedy routine and THEN gone to the last dig. I don't understand why, she should have finished the two digs and then gone to the computer. 

If I tell them to do digging and then go home to use the toilet, or get a meal out of the fridge, this doesn't happen.