The single letter issue has been reported here:
https://github.com/CalderaWP/Caldera-Forms/issues/1027
If you could add your comments to that, it might help.
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 9 years, 4 months ago by cbomkamp. Reason: Fixed typo
I have the same problem. I created an issue in GitHub for this:
https://github.com/CalderaWP/Caldera-Forms/issues/1027