Frequent forum bug

Quite a lot of the time when I try to read a forum topic or open a forum subsection there will be a random letter combination between .com/ and /forum, and the forum will burp that the thread is unavailable or deleted. Either retrying, or manually deleting this letter combination fixes the issue every time, but it's still annoying.

IE: I'll get something like www.pathofexile.com/KtkNM/forum/view-forum/40 which doesn't work, and then cutting it down to www.pathofexile.com/forum/view-forum/40 fixes it.