It seems the software is not removing expired ads from the ad count. It is, however, only showing the current ads in the ad list. It is also not deleting expired ads after the 10 (or 30) day limit, so the ad count goes up because nothing is deleted unless you do it manually. Apparently it is also not sending out the usual (or what had been usual) half-life, pre-expiration and pre-deletion emails. (kinda makes sense if they system isn’t going to delete them.) You can see this if you search for ads by a specific person. You shouldn’t be able to see the expired ads in anyone else’s ad list except your own, but I can see them for several of the sellers.
The last time it had problems like this, if the ad count said there were 57 for sale ads total, but say only 38 of them were actually active, there would still be 3 pages of ads, but all of the entries after the first 38 were blank.