credit score dropped

My score has remained unchanged at 605, and clearscore dropped by 14 points to 591. I have not missed a payment in any of my accounts, one of them is nearly paid up and another is at 40% credit use. Ive never missed a payment on my cellphone contract. Please explain how this happened. Some if us were impacted by covid and lost employment. We are trying to rebuild our credit profiles but experian is working against us.