Personally, I think there may be two reasons. One is that you haven't exercised for a long time before, and then your muscles are sore after practicing yesterday, which leads to "retrogression" today, or you just started doing it for time, and your movements are not so standard. Now that your strength has increased, you have achieved the standard unconsciously, and then there is no time to support it before ~

Or you can go to the gym and ask the coach about your specific situation, because after all, I don't know what your situation is.