For Facebook for example (https://leetcode.com/company/facebook/)

I know that I can sort by frequency and there is a bar to the right of the question that indicates how frequent a question is. That being said when you go a bit down on the list you see that a lot of questions, when you click on the question and click on the companies that asked this question there are less counts of it than questions that are lower in the facebook premium list when it is sorted by frequency.

I am a bit confused about this, can someone explain this? why is it that some questions are higher when you sort by frequency but their actual count when you click on the question and check for company, is lower than ones that are lower on the list???