I am searching through the problems for a specific tag. A day or so earlier, the problems are nicely sorted by problem number. Right now it doesn't seem to be sorted.

Here is page 10 of constructive algorithms retrieved as I wrote this. Link: https://codeforces.net/problemset/page/10?tags=constructive+algorithms

Not all tags are affected. For example, the divide and conquer tag is sorted. This is also how I expect it to work.

This is an important feature: I plan to do only early problems with tags shown and save recent problems for virtual contests.