Cloze Deletion not working

My Cloze deletions aren’t working. They come up as their code types ie. {{c1::equilibrium potential}} instead of actually showing me a blank statement I need to fill in. I have tried changing the card types by going into browse>cards>selecting all the Cloze cards>changing them to cloze types and so far thats not worked. It was fine before but now it is like this for every card. Can anyone help? I have included a screenshot of what it looks like. Thanks!

Please click Edit, then Cards, and ensure you have {{cloze:Text}} in the front template.