LSAT V. LSAT-FLEX?

Hi all! I just did at PT with all 4 sections on, and did about 10 points better than when I take a PT simulating the LSAT-Flex. I understand that the original PT with 4 sections is supposed to be worth more or what not, but is anyone else experiencing this? Or are my scores just fluctuating like crazy? I write the Flex on the 10th and am becoming fairly discouaged!