I'm having the same issue as the above. If the catagory has more than 1000+ runs, when I click the "load more runs" button it will reload the page and no times will load, not even the top 1000.

I sometimes get a "504 Gateway Time-out" too.

Edited to add: I've tested this on 3 different browsers, 2 different PC's and on mobile, while both logged in and logged out. Same issue every time. It did used to work about 2 weeks ago.