Why my aircraft have 571 parts and it's Predecessor plane is actually only 85 parts, how?

Nah, nvm i now what the problem is
A small parts at very front of the aircraft is not count as x:0.0000 and when i'm using mirroring multiple times it's duplicate tge parts until touches +500 parts. And my aircraft was actually 60 parts & cuz of that it touch 570 parts

Sorry for bad english!