Hello,
I see that you’ve already tried a few things, but to make sure we’re on the same page, could you please follow these steps?
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Make sure your “Extra” field is unprotected (the box should be unchecked). Here’s a tutorial on how to manage protected fields: How to Manage Protected Fields
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Reset local changes by following this tutorial: How to Reset Local Changes
If the issue persists, please send us a screenshot of a card that has this problem so we can see more details about what’s happening.