My list of missions is here
One random picture does not a theory prove. I've tested this over an over when I was playing. Results were consistent with the "complaints".
The thing people dont realize (or want to realize) is that when you send out a specific type of mission too many times it starts to stop being refreshed in your list. This list of missions popped up after a lot of companion gift missions, the top mission that cant be seen was a moderate fabric one. This works the same way if i had done only metal missions, i would stop getting metal missions and get more gift/fabric ones
This has been tested also. It is not true. There is no control that limits a mission based on how often is it taken.