When the away team selection screen comes up, I only have a choice of three bridge officers to come with me. I should have a choice of four.
Sure, I can request reinforcements on the ground, but I just get a generic redshirt, not one of my BOffs.
I did several exploration missions with my level 50 Romulan/Federation character, and an episode and several exploration missions with a lower level Federation character. Every time I needed to form an away team, I only had a choice of three BOffs.
I've noticed this issue as well. I've been testing the tutorial mostly, and had initially assumed it a holdover from that, but it continues well after I have enough bridge officers to take a full party along.