Hi @Anonymous,
Have you set the AutoHeight property of the DataCardkey control to true?
I have made a test on my side, and don't have the issue that you mentioned. Please check if you have turn on the AutoHeight property of the DataCardKey control within your Edit form.
Please take a try to turn off the AutoHeight proeprty for the DataCardKey controls within your Edit form, check if the issue is solved.
Please also take a try to turn off/disable the "Improved app rendering (final validation)" option within Advanced settings of App settings, then check if the issue is solved.
If the issue still exists, please consider take a try to re-create your app, check if the issue still exists.
Best regards,
Kris