Bug: No LingQs on mobile app iOS

I am a premium member.

For some reason on iOS I am not able to review my LingQs. I have a lot of them and just added new ones. I see this when I press on “review your LingQs”

Do you see that when you try to review LingQs directly in a lesson or from the Vocabulary page?

I see it both in the vocabulary page and in the homepage when I press on the “Review now” button. It seems that LingQs are there for 1 second then disappears. Could it be that it tries to sync with the website or something?

On the web I can see more than 700 LingQs