User blog comment:DaNASCAT/Technical Update: February 20, 2017/@comment-1398253-20170223035715/@comment-126761-20170226030502

This is something we've been looking into - it appears to be a kind of caching issue (the link is correct, but it's being inserted before it 'knows' the link is correct, and fixes itself after a short while). We're working on some tweaks in this area, which will hopefully stop this from occurring.