FEA testing - results question

So i'm testing an assembly of bicycle parts and when they are in an assembly i get a minimum FOS of 1.12. When i test the part separately in the part-file form, the FOS increases substantially, to 1.47.
I'm using the same mesh size, same force, same restraints.
Anybody have an idea why i'm getting two completely different results for my models?

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There must be an interaction between the parts in the assembly. If you restrain the parts exactly the same as in the seperate models, you should get the same results / FOS
Is it possible you specify the material prop differntly in the assembly?
Is there a deflection of one of the parts, forcing another part in a extra deflection?

 
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