Thanks!
It seems that you shouldn´t use the same ID in CARP as VRRP if they exist on the same subnet. I would suggest adding a option to change VHID from the gui in clearpass from default to avoid issues for customers using both vrrp and CARP on the same subnet.
From: https://doc.pfsense.org/index.php/CARP_Configuration_Troubleshooting
Conflicting VHIDs
The VHID determines the virtual MAC address used by that CARP IP. The input validation in pfSense will not permit using conflicting VHIDs on a single pair of systems, however if there are multiple systems on the same broadcast domain running CARP, it's possible to create a conflict. VRRP also uses the same virtual MAC address scheme, so a VRRP IP using the same VRID as a CARP IP VHID will also generate the same MAC address conflict.
When using CARP on the WAN interface, this also means VRRP or CARP used by the ISP can also conflict. Be sure to use VHIDs that are not in use by the ISP on that broadcast domain.