I've not seen bonus SQM like that before. I have a premium CC and so saw the rollover SQM is in green for my account too.
I've checked my daughter's account, as she has some flights in PE this year. She has the same black bonus SQM displayed.
In her case if corresponds with the extra SQM she got through Class Of Service.
So like Mrs W, I suspect this is a new tool implemented by AC.

To be honest I like it. It gives an indication of how paying for the higher fare classes have helped get you to the Elite status threshold.