I see that there are several different types of categorization for company specific preparation. For example, for Facebook, I see these following categories:

• [1] From the "Explore" section, "Get Well Prepared for Facebook": https://leetcode.com/explore/interview/card/facebook
• [2] From "Problems" section, "Top Hits": https://leetcode.com/problemset/top-facebook-questions/
• [3] From "Problems" section, "Topics" (can be sliced by time period of 6 months, 1 year, 2 year and all time): https://leetcode.com/company/facebook/

The data in these three do not add up. For example, the question "Merge k Sorted Lists" apears on the 1st when ordered by most frequent in [2], but appears way below 10 positions when ordered by frequency in [3].

Is this a bug? Does anyone have any idea how I could truely find out the questions asked recently the most (frequency)?