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Deff balance chasing you on severl on those cards... High utilizastion with a recent late appears to be the case. Sorry OP
This is why I try to teach people not to go and get several credit cards while you are in the 600s.
1) Low starting lines which can make you go above 30% with relatively little money owed.
2) High interest rates.
The best way to protect yourself is to not spend money you really don't have. PIF every month. I really wish the CC companies would do a better job of educating their customers. Tell them paying the minimum is never acceptable. When they list a minimum payment it gives some the right to only pay the minimum and then spend more on the card before the next payment is due.
My credit card in college was a $300 limit. I sure could have used some basic life skills my parents never taught me.
This 100% has to do with the OP adding a piece of recent negative information to their credit report in the form of a 30 day late. He could be at 100% utilization on his cards and it wouldn't matter; the 30 day late was the catalyst for all of this IMO. Plenty of people sit at 100% utilization for months, even a year or longer and never have AA taken against them so long as nothing adverse enters into the Payment History sector of the FICO pie.
All that said, one thing I'd suggest doing if you actually care about any of those Synchrony accounts would be to try and get that 30 day late payment removed ASAP. Since it's of the weakest severity, assuming an otherwise stellar payment history with whoever the creditor is you stand a strong chance of them removing it. If they remove it, you could contact Synchrony and try to recon some of the AA taken on your accounts. You could tell them that the late payment was a mistake and has been removed and you'd hate to see that mistake ruin your favorable relationship with them. Just a suggestion here.
Prior to this 30 day late payment, when was your last negative? Mid 600 scores outside of this 30-day late payment suggest that you have a dirty scorecard otherwise, so I'm just wondering what else you have on your report that is adverse?
Synchrony strikes again! So sorry this happened to you, OP. It really sucks. Just take a deep breath and make your plan. We all have or have had ups and downs. You can get to your goals if you persevere. Best of luck to you!