Getting slow internet speeds on wireless devices on my Xiaomi AC2100

Hi , I just installed openwrt 19.07.7 build by @scp07. I'm getting mixed results from my internet speed test. I have two wireless devices getting around 200 Mbps while the rest are only getting around 50 Mbps. Before installing openwrt I can get the same devices to 200 Mbps. Could anyone help me out with this?