Fortigate - website category mismatch

Hello,

From yesterday we experiencing problems with websites beeing blocked because they belong to category that is blocked. This category is "unrated" which under DNS Filter is set to Redirect to block page.

One of those websites is "docs.fortinet.com". Ofcourse that particular website category is "Information Technology", but for some reason Forigate categorizes it as "unrated".

I can access docs.fortinet.com as soon as I add it to Static Domain Filter.

To make the matters worse, this doesn't apply to every site.

Where can I search the problem?