Two months of LeetCode and I can't tell if I'm getting better or just memorizing patterns

Two months in, roughly 140 problems done, and I genuinely can't tell anymore if I'm building intuition or just recognizing 'oh this is a sliding window one' from the shape of the question. Redid a medium I solved three weeks ago cold and it took just as long the second time. Is that normal at this stage or a sign I'm doing something wrong?