So, i was in the middle of a Huge multi-star game against 2 AI-controlled opponents, A Hard Vasari, and a Hard TEC.

I was Advent.

I had just captured an Ice world, about 3-4 Phase lanes out from my worlds, meaning its Allegiance was quite low.

However, just after i had captured it, the Vasari Faction (whose backyard this world was in), where suddenly defeated. 

Still, my allegiance dropped, despite my culture now racing around the star system.

i was given a warning that they would soon overthrow my world. no real biggy there.

NOW, here's the part i considered weird. 

Just as, or IMMEDIATELY after the world fell, i was told that an enemy were attacking.

figuring it was more TEC Rebels, as usual, i scrolled over, to see one, Level 1 Radiance Class Battleship in the colours of Rebels, attacking my Radiance and Progenitor! I thought this was a bit crazy, but i decided to just toast it and take back the world, mid way through the fight, however, a full advent fleet of Rebels, as though they were being generated by the TEC ability, suddenly jumped to the gravity well from nowhere! 

Still stranger, they attacked the TEC when they showed up!!!

is this normal? or a glitch??

its not mentioned anywhere i can find, nor is it mentioned on the wiki!! 

i got screenshots if any one wants to see the fleet.

EDIT; the Radiance is even named the TDM METERUM!