12 point score drop on August LSAT

Has anyone experienced a very large score drop compared to normal PTs? I dropped about 12ish points, almost close to my diagnostic score from almost a year ago. I know for sure I did poorly walking out of the test room but I did not know it would be this bad.

Although I felt calm, my brain foggier than usual, room was rather cold, and i guessed on more questions than i usually do (I usually guess / leave to chance 1-2 per section, this time i left about 4 per section).

I don't know if it was because of finally testing in a room with other people, the cold, the exhausting week I had before, or whatever, though it is likely a combination of them all.

Before going into this, I was actually banking on better testing performance than my practices, which is how my SATs went.