Weird!!! Help pls!

Kr

Has anyone had this happen before. I noticed that my FRERs werent getting as dark as I wanted as I kept testing daily. Yesterday at 12 dpo and the day before the test lines were dark but thin. Looked the same both days. I’ve seen darker in my days though. Took another one today at 13 dpo still light. Decided to take a clear blue plus. Last one I took was Wednesday night and that clearblue was light. Today, the clearblue is blazing and the free are lighter. I’ve never seen a clearblue work better than a frer. Anyone knows what’s going on here?