Similar Questions on Different Prep Tests

I feel as though I am going crazy. I had done a number of prep tests before using 7sage but I kept track of which ones I had taken. I am doing tests I have not done before now and most the questions feel familiar. I know they use the same stem multiple times but I feel as though my good scores are coming from the fact I have done these questions before although I may not have done them before. Is this happening to anyone else?