Cards are blank

Hello I just updated anking and am new to ankihub so unsure if there is something on my end I need to fix but every few card they will be blank. The scheduling options are still available and when i click on edit I’m able to see what the card is but there isn’t actually anything showing up. When i go into edit and then click preview it shows a blank card as well. There’s a little red flag on the corner and not sure what that’s for either, thanks!

Can you go to tools-> empty cards and delete any empty cards

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