LingQs of the day - All known words

Usually LingQs of the day work well with a mix of status types. On the 25th of July I got 50 LingQs of the day that were all already known. What could cause this? (Russian)

Known words are still included in the SRS algorithm until they are set to “Never” review.

I meant that all 50 out of 50 were already known.

Yes, but if you make a word status 4 it still is included in your SRS words. To make it so that it does not appear again you have to click on the four again and click never in the box that appears.