ABAQUS different nodal temperatures obtained by thermal stress analysis from those imported.

Hi ABAQUS experts,

  I am working on thermal stress analysis using ABAQUS in sequential order. I found that nodal temperatures resulting from stress analysis are different from those imported. I thought that the stress analysis procedure does not affect thermal analysis. 

Can anybody explain the methodology utilized in sequentially coupled thermal stress analysis in ABAQUS? Many thanks.

Best regards,

Changrong