Hello Ryan,
I suspect you may be running into the following defect:
CSCsr84426 IPPA dynamic stats are not being updated while on a call or ready
This is resolved in CAD 7.5(3) but I would recommend upgrading to latest CAD train that is compatible with UCCE 7.5(x).
You can go to CAD 7.5(8) direct from 7.5(3) or you can go to the latest compatible version which is CAD 7.6(2).
However, you would need to install CAD 7.6(1) first if you are going to go to 7.6(2).
All of these are available on CCO to download.
I hope this helps.
-Denis