My basic idea is that these ‘sterile’ neutrinos are actually neutrinos that happen to hit the detector at the moment of their switchover. Like an object that is going up until gravity makes it reverse course...................
The sterile neutrinos are like ordinary neutrinos as they are spin-1/2 particles that do not possess electric or color charge. But, the sterile neutrinos do not carry weak nuclear or hypercharge. The streile neutrinos are right handed and ordinary neutrinos are left handed.
They can not be normal neutrinos during a switchover.
More here https://arxiv.org/search/?query=sterile+neutrino&searchtype=all&source=header