Very different results from v44 and v42a

Dear all,

I built a model in COMSOL42a before and obtained reasonable results then. Now I try to update to COMSOL44. I understand there might be some change between these two versions, but I don't expect the results are so different. For the moment I only spotted the relocation of PML, which turns out not to be the problem.

Does anyone have similar issues? What could be the cause of this inconsistent results?

Thanks!