Good call out. I've seen this before. One time it was because I didn't have access to something in the card. The second time was a mystery. I just deleted the card and rebuilt it. Do you know what the card is supposed to do? Double check any security, like if you have a role, selective access is on, or it's an image and you don't have access to the image.
I am learning this platform on my own, so I don't think there should be any issue regarding the security or the role.
The card is not an image it is just a normal grid card showing some value.
And yes, as you did I also rebuilt the card. But since I already did that twice, so I thought it would be better to ask and confirm if I need to make some corrections while saving the card or something like that.
Here's how it is supposed to look. Can you check all three of these to make sure you have the same settings? I can't replicate the error, so if you are sure you've got these set correctly you might want to give firstname.lastname@example.org a note with your screens (3 of them as shown below). Hope this helps!
The grid on top is from REV03, Forecast Periods Saved View and should look like this
And the application of the saved view in New UX should look like this