Can't change "Max reviews per round” setting

Hello, I can’t change the setting “Max reviews per round when playing new sentences” from 5, both on app and on the browser.

I’ve seen this bug happening to others on the forum, is it a bug?

To be fair I could change it by the website, see these screenshots

This works

Via this button on the website (using Android or desktop browser Firefox/Chrome) I could change the setting:

This doesn’t work

Via this button on the app, the number sticks to 5, (here it is 0 but it is because I had changed via website first, as stated above. Changing it via website will change in the app too.)