Displacement mapping challenge

my study area is the same
1.While I use one month interval. It seems like convening It has some correlation with the DInSAR fringe/,however the number i saw on the displacement map is highly exaggerate? why this?



2. While i use one year interval. it seems like convencing on the interfrogram, but the displacement map i produce is completely wrong/it is out of logic/ ! i use band maths to modify it , but nothing changed? please give me your help?


3. While i do mosaicking ,it seems like perfect on the interferometer,but not on the displacement map?
why this how can i solve it?

It is my hope as i will get important answers to my challenge ,Thank you!