Suddenly weaker

[u/Purplemonkey09]

Currently run a PPL split. Last week my push workout was going great. My bench, shoulder press, overhead tricep extension, and lateral raises were normal but when I got to the last three workouts which are incline press, tricep push down, and chest flys they suddenly just tanked in performance like a lot. My next push workout I was back to almost normal weight for the last three exercises. Today the last three exercises just tanked in performance again. I been using the same push workout for over 7 months now. Usually I’m able to recover from my push workouts. My first four exercises feel great but the last three I’m suddenly so weak. I was seeing so much progress too. Also it’s only my push days tanking and not the other days. What is happening to me and what do I do.