Bank balance doesn't match my budget, yet I have positive inflow on my credit cards?

I'm using YNAB online. My bank balance says I have $1334 available. My YNAB budget shows I have $211 available to budget, and no positive balances in any category, with $0 to be budgeted. However, My two credit cards have positive balances of $1100 that appear to exactly make up the difference between my bank and my available budget. It says to the side that this is "cash left over from august."

I don't understand how I have a positive balance in my credit cards? It appears almost that every time I make a cc purchase and approve it, that amount goes into a positive credit card balance that I can then move over into my "to be budgeted" category? Why? I can't wrap my head around it. Thanks for any help.