Sometimes it does it after a single search for me. It does the same thing in the grammar library.
This has been happening since the major site revamp. I really miss the old flow chart version. Not only are we limited in the number of searches, finding non-renshuu-made lessons is nearly impossible.
Holding onto complains and expecting me to some understand that they exist without communicating them in some way is not going to result in any improvements. Anyone that's been on renshuu long enough should know that I go to insane lengths to hold onto features, functionality, and settings even if they don't have a lot of use by newer users. I really do not believe that anyone could name more than a couple of features that have been outright removed, or limitations added when there were originally none.
It is my hope that when an issue comes up, instead of assuming that I removed it because that I removed it, that users would say "Hey, I used to be able to do X, but I can no longer do so. Was that intentional, or is it a bug?" 99% of the time, it's a bug.