Stupid troop transports that don't drop troops...

[trooper]

Maybe a subject that has been exposed in details before, but I haven't found answer to my question in the FAQ.

Here are my new armed troop transports :
(unmodded 1.91 game)



- They have the "capture planet" ship strategy
- They are in a fleet with "planet capture" strategy.
- They have troop inside.

I sent several attack this turn, all of them were sucessfull : planet defenses have been destroyed and ennemy ships too. But after all defenses are cleaned, the troop transports stay away from the planet and don't attack. (see picture)

So what can be the problem with those f$%@#'in ships ?

Small detail : I'm not at war with the attacked empire, only in a "treaty none" state...