https://github.com/CalderaWP/Caldera-Forms/issues/1027
Looks like it was introduced in 1.4.6. Downgrading to 1.4.5.1 solves the issue but if you can add your comments to that GitHub issue and include your WP and PHP version, that would help.
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This reply was modified 8 years, 2 months ago by cbomkamp. Reason: Fixed typo