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https://forums.elderscrollsonline.com/en/discussion/684716 
How come some siege gear doesn't "stack" with other siege gear of the same type? 
   
      
      
      
                  
            
               
                  Sorry if this question has already been addressed.
Spent a little time on the test server (PTS) for EU/PC. I guess it's Update 41.
I took siege gear into inventory then used "stack" in Inventory.
Example 1
For 33 ballistas (ballistae?) of one specific faction, I got:
-- 1 stack of 25
-- 1 stack of 8
-- 4 stacks with 1 each
Example 2
For 26 cold fire trebuchets of one specific faction:
-- 1 stack of 14
-- 1 stack of 6
-- 6 stacks of 1 each
Each item for stacking had the exact same name/description, but I guess there must be some difference in them that I don't see?
Anyway, how come some siege gear doesn't "stack" with other siege gear of the same name?
An aside: Love this change! Thank you!