Why my result from stress analysis isn't symmetry?

[bli22]

Why my result from stress analysis isn't symmetry?

I am modeling a telescope support system. The result I got from the analysis always not symmetry, the difference is very small therefore I think the test setting shouldn't have any major problem.

The difference could be cause by the round off during the simulation, if I am right about it, is there anyway to improve the result?

Here is the result I got.

 

Thank you !

[JDMather]

Attach your file here.

[bli22]

It's a big file, contains many small parts. if you want it I can sent you a zip file.