Sad pikachu

When doing reviews, after I finished a collection (e.g. the 5000), the next collection (e.g. the 10000) with unfinished reviews is preselected, but when I press enter, instead of going to that next collection, I get the sad pikachu, telling me there’s nothing more to do, which is false.
If I explicitly select the next collection again from the dropdown and then press enter, it continues as expected.