Are you sure all the weapon platforms are gone. Check your capture planet fleet strategy to make sure your other warships will/did attack the planet.
Troop Transport type ships will always run for the corner if they have troops on board and other ships and WPs are there. After the WPs (or ships) are killed it will then come in and land troops. Be careful with the weapons. It will come in firing and could kill a defenseless planet off before you get there with troops.
I have had CLs with Cargo and weapons capture planets so a transport is not needed. I have stopped putting weapons on them because of accidental planet deaths.
Only in SEIV can someone talk calmly about an accedental planet death.
OT: Why is the shield destroyer on the far right in the design. I have not tested it, but thought this caused it to fire Last (after all the other weapons to the left fire)
