Need way more details. What unit? What tech? Is there a campaign file you can attached. You can submit that information to the Github tacker in my sig.
Thanks
Sorry
Hope this helps a bit
Opening the Wolf and Blake campaign, I choose Stacy's Zeus, and change the tech to mixed IS Tech, changing the IS Light engine to Clan XL, the tonnage under statistics stays the same.
Next I change the armor to Clan Ferro-Fibrous, and am unable to auto-allocate the armor, as pressing the button does nothing.
Next I remove all the equipment, the tonnage stays the same.
Then I go to assign criticals, and everything is still there.
From what I can tell, changing to mixed tech is the problem, but I would highly suggest try a few changes and look into it
Thanks