There are a few possible explanations:
-You have been doing more volume than you can recover from and the accumulated fatigue is affecting your strength. When was your last deload?
-You are cutting weight too fast and it is affecting your strength.
-You just had a shitty day for whatever reason, maybe stress from issues unrelated to lifting or you didn’t sleep well.
Just about everyone sees the same thing when they look at records. They are called records for a reason, they are not some easily attainable numbers that anyone can achieve after a few months of hard training. Not everyone will progress at the same rate either, people often say that powerlifting is a marathon and not a sprint. If you are able to make some noticeable progress between training cycles then you are moving in the right direction, but cutting significant amounts of weight is likely to affect that as well. If you are going nowhere while training hard, eating sufficiently, and sleeping well, then there is something wrong with your programming. Post a week of your training.