And I am going to add some thing really strange. When I copy these 14 subjects that shown errors to another folder, and used OPEN new from fmriprep separately, this time all covariates for each subjects turns to size 200! Even though they were wrong when I import all 151 subjects.  However, this time when I click DONE in Setup, another error pop up, which said one subject's bold image only has 14, while the covariates is 200. So, I doubt this happened in the import step. I attached the conn_*.mat for these 14 subjects.

Thanks

Hongru