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TMS320F280039C: Why XAR2 is changed?

Part Number: TMS320F280039C

Hi expert,

My customer finally locate their code go into NMI handler beyond expectation due to the error change on XAR2.

They compare the disassembly code and find no use on  XAR2. But it did changed. and there is no use for stack.

their code is as below:

Before they run the code, XAR2 is 0x0000E478. 

After they run the code, XAR2 is 0x003FE478.

What can cause this happen?

BR

Emma