(1) https://xcraft.net/battle/index.php?battle_id=61563fcb89a28bfd8c9503734a748c1b
(2) https://xcraft.net/battle/index.php?battle_id=122ebce3b00f67ee74ed73318a160796

The xerjs Tower was attacking only stealth fighters, instead of attacking both stealth fighter and normal fighters.
To force the xerjs tower to attack also normal fighters, it's necessary to command the fighters to move foward.

I guess this is not working as intended.

What do you mean under "xerjs Tower"?

Hi. i mean the "Creep Colony". If you watch the first battle report i linked, you can notice that the creep colony is only targeting stealth figheters istead of targeting both stealth figheter and normal fighters.
Also on the second video "Creep Colony" was attacking only stealth figheter, but once i command the normal figheter to move foward, the creep colony started to attack also them.

Not a bug. Description is below. It's a translation by Google. Original info is here: http://xcraft.matrosite.com/wiki/%D0%A3%D0%B4%D0%B5%D1%80%D0%B6%D0%B0%D0%BD%D0%B
8%D0%B5_%D1%86%D0%B5%D0%BB%D0%B8

Keeping the goal
Target retention (target lock) - the ability to continue firing at once selected enemy. The retention of the goal differs from the concentration of the fire in that each of the attacking units captures its target, the initial choice of which is random.

Holding the target allows units with a low damage per shot and a large number of shots per round to deal larger units with the same damage that would cause one shot with the same total damage.

Capture
After the new target was chosen for the attack, it is marked as captured in the sight. All subsequent shots of the attacking unit will go to this goal until the capture is discarded.

Reset capture
The target capture is reset in cases where:
- the goal is destroyed,
- the target is out of range.