"Actual Load" RDM Reading High

I have hooked up my Cem3 and Sinsor + dimmers to my console through ethernet, the RDM seems mostly fine, but I am confused by the "Actual Ampere" reading, it seems high, for example dimmer 26 says it is 429.6 Amperes. It is a D20 module and all I can find is in the CEM3 Manual it says only AF modules have this feature. So is this just a faulty reading because it's the wrong card or am I miss understanding the meaning of that feild? Also do I understand correctly it needs to be an AF card to be notified if the dimmer blows/pops too?