When using the P.I. filter, users are probably not aware of the fact that multi-OB data logically can have more than one P.I. On the archive science portal such data have no P.I. (field is empty). With a P.I. filter set to a specific name, such data are NOT visible (although the selected P.I. contributed at least partially to the data).
It would probably be good to modify the underlying logics such that data are always shown if the specified P.I. has contributed (either in the traditional sense, one OB has one run has one P.I.; or in the advanced way, the data product has contributions from one P.I.).
Customer support service by UserEcho