I bought Leetcode Premium. I'm practicing Tree tagged problems this week and sorted them by frequency(more frequent problems on top of less frequent ones). But the problems like in 2-5 top frequent positions have .

Like this problem https://leetcode.com/problems/validate-binary-search-tree/ is way down, even thought it has total 10 companies and has been asked 70 times in the 0-6 month timeframe. But the problems above it https://leetcode.com/problems/unique-binary-search-trees/ have only 14 times int he 0-6 timeframe. This problem has been asked only 4 times in the equivalent period, but it is also way above the Validate BSt with frequency of 70. Same with https://leetcode.com/problems/unique-binary-search-trees-ii/ has only frequency of 4. Another more frequent problem is https://leetcode.com/problems/kth-smallest-element-in-a-bst/ but it's almost on the bottom of the sort.
Does this frequency sort even work?