Words not "known"

First of all, I’m fairly new (signed up a long time ago, but started doing Lingq recently) and not a paid member but I believe you can still go through a page and make all the blue words “known” , right?

For some reason, I can’t do that on my desktop, but I can on my android phone without a problem. Is there some issue I’m not aware of?

On desktop ensure you have “mark all words as known when paging” selected in options.

Image of the setting:

I do, for some reason it still doesn’t work.

I can move all words to known if I finish the lesson though. But that 's a bit hard if there’s a big document to work on.

Edit : Had to make another account. For some reason, my new account doesn’t have this issue.