The same thing that spagg68 describes happened to our poiints last night 24/1/18.
Although we have not been using challenge checkers on our iPad (they don't work on there any more, and that has been reported in another thread), we have used some on our desk top computer so we had some points between January 1 and yesterday. There is now no longer a line on our points chart to reflect those from using challenge checkers, the points have disappeared and the total has reduced.
Did this happen to anyone else yesterday?
spagg68 - did you get a response from Support for your original request?