What cards do have? Make sure they are showing in the Windows Device Manager without any errors.
If you mean me, they're a couple of 470 and 570 of 4GB, they all good in device manager, and patched with amd patcher.
If you are on Windows 1803, it could be from the update. There are many mining related issues from incompatiblity with the 1803 update. There is no need to use Aferburner with the Claymore miner anyway. You can set the core clock, memry clock, power limit, undervolt and fan speed directly in the miner configuration file or .bat file something like this
-cclock 1150,1150
-mclock 2000,2000
-powlim -15,-15
-cvddc 875,875
-mvddc 875,875
-fanmax 80
-fanmin 30
-tt 68
-tstop 75
I'm aware but the fans wont work right in claymore, some of them will show 0% and some other show whatever speed i didnt set, and thats just not the thing, they GPUs' temp go high because of this so i can't really use it cuz fans doesn't work for me idk why