The reason is your RFP license. You only have 32 of RFP licenses. The controller needs to have an equal amount of licenses to fully utilize all licenses you have. For example:
AP: 51
PEF: 51
RF: 51
If you have an unbalance number, the AP will only allow up to the minimum of whatever license you have. In your case you have the following:
AP: 51
PEF: 35
RF: 32
Controller will only allow you to use up to 32 APs. Need to explan your RF license to go beyond 32 and may need to do the same on PEF as well if you need to go beyond 35.
-Mike