Cloaking bug ... or?

[Newbie999]

Ok. I'm new at this. I sent a cloaked ship through an enemy system and found a colonizable planet on the other side, so far so good.

I have a non-cloaked satelite group on the warp point in their system, that the enemy picks fights with but never gets into range.

I created a cloaked colonizer, a cloaked attack ship, and a cloaked supply ship. I made them into a fleet. I sent the fleet through and *blam* -- they saw my fleet.

Does cloak not work for fleets? Did the presence of a non-cloaked ship make them enter attack and then see my cloaked ships?
My ships were cloaked during tactical combat -- but they targeted me anyway? What went wrong?