Weird invasion fleet AI behaviour...

[Foraven]

I am playing with the latest beta (1.3.3.8) and I keep running into weird fleet invasion behaviour. For example, half the fleet parking itself away from the planet while the other half move in to invade; the ship hanging remain passive, even with enemy ships around (they only take pot shots at them without moving). The other weird behaviour is invasion fleets trying to invade without or with few troops; One of my invasion fleet got in range of a well defended planet, started to fight but none of the troop transport had any troops in them. Another one of my invasion fleet was parked around a planet it just invaded but was not responding to being attacked by a few enemy ships that warped in.

Something not working right.

My game has a few mods, but as far as I know none of them affect ships or fleets AI.

[MaximKI]

Do you have saves you could share with us that demonstrate the issue?