Issues Mining with 2 or more Video Cards

I'm not sure if this is the right place but I'll post the question. I have a Asrock z97 Anniversary board capable of handling 5 cards I believe and I can't figure out why I'm running into these weird issues. With one AMD rx 480 card in using a rider on the top PCIe slot it works fine and the stats show up on afterburner and nicehash for one card in. When I plug another card in using a riser into the second PCIe slot which is a RX 470 windows will recognize both cards but msi afterburner will not show the stats for the 470 and when I use nicehash I can't benchmark the 470 since it says it had to terminate dagger. If I unplug the 480 and leave the 470 in it works as normal. Has anyone else had issues like this? I'm wondering if the motherboard is bad or if the risers are possibly the issue.