Last week (Friday and Saturday), some creators were reporting an issue with seeing new patrons in PRM. This was identified as a bug and fixed. This may have been what you were experiencing at the time you made your post here.
Additionally, as mentioned previously, there may be some delays in PRM updates close to the 1st of the month as payments are processing.
It appears to have happened when they changed the way they displayed active patrons (i.e. I believe it used to automatically remove a patron from the count when they cancelled, not when their subscription actually ended).
As Hayley mentioned, there can be some delays in displaying new patrons in PRM around payments processing. We recently released a fix that should solve most of the issues around the delay in patrons showing up in PRM around this time, so that should take care of the main issue presented in this thread. Hope this helps!