Agreed, there seems to be some kind of inconsistency which ends up making CCIP/CCRP inaccurate sometimes.
I've had some instances where the marker seems to be showing the correct impact point, but then it gets messed up when flying over mountains/hills. Then, when going back to flat terrain, it is still messed up as if it won't revert back to the correct impact point.
When spawning mid-air in Mission Editor with bombs, I can consistently drop them on target and the CCIP marker is accurate. But when I try that in multiplayer, by the time I get to the target, it usually seems the CCIP is inaccurate by that point.
So any weapon that uses the bomb drop CCIP/CCRP marker seems to be affected.
Rockets and gun seem to work well for me consistently.