I will use short sentences to try and explain the bug. If anyone has a workaround let me know as I haven't seen this in the forums.
One of my science officers now has 3 tier 1 skills( 1 ground and 2 space). This happened when I tried to train a new skill on him. I traded out tac beam with Jam Sensors. When this happened the MES rank 9 from my first science officer was duplicated on my second. The problem is that I have no way to access Jam Sensors now as it doesn't show up in my skill set. I can only use MES. I tried promoting him and still can't use the Jam Sensors ability.