Abaqus Fully Coupled Thermal Analysis, Discontinuities

Hi everybody, I have done a Fully-Coupled Thermal Analysis using Abaqus. The analysis is done for a structure created as one part, where i have defined 2 different materials using partitions. The materials have similar young modulus. It seems i get correct and continuous results for nodal temperatures and displacements. However when I analyze the stresses the change of stresses on the boundaries or intersection of the 2 materials is discontinuous. As i am modelling the structure as one part, i dont consider interaction properties and Abaqus consider the 2 materials as bonded or welded. Should i expect this discontinuities?. I have refined the mesh around the interactions of the two materials and checked the properties and loads and still have same results.

Do you have any suggestion what could be happening or what should i check as next step?

Thank you very much

Roxana