Frequently viewed topics report does not provide the right data*

Hi experts,

I have a project published to  RH server 9 with webhelp pro. the frequently searched term gives me the reasonable counts, every time when the same term searched, the count increased. but the frequently viewed topics report does not increase the counts for the topic that I clicked multiple times (every time I click on other topic then come back to click the same topic). the adobe support told me I should close the window, then re-open the link and click on the topic again, but it still does not. what we eventually find out is I have to delete all the history data in cache, and reopen the window, then click on the same topic then the count will increase by one. 

I am wondering whether this behavior is normal or not. if it's normal, how do you use this report?

Thanks,

Frances