I use dag fix beta drivers, and have same issue...
Only with V1.5.8 ?
I have this issue with 18.5.1 and 18.5.2 on 1.5.7 and 1.5.8 versions. Windows 10 1803 x64. And wrong names of cards. 1st 2 RX 580 cards detects as R9 200 series. I have 3rd card r9 270X.