Prohashing speed drop

Hi, been testing out prohashing pool for a day now with 5 Goldshell X5s, and all 5 of my miners are reporting 100mh less on the prohashing website compared to my miners interface (they should be running at 600mh but says 500mh) is this because of the constant mining changes it makes with the pro switch settings, or perhaps on my end? Thanks

Edit: I’m going to run it to mine litecoin only for a day and see if that fixes it