Some of our appointments are being changed to an hour earlier than users have entered into the online portal. How do we fix this?

I cloned your form and tested it but was not able to reproduce the issue.

I got that same selected time in the email and also on the form submission page:

There are over 1100 submissions on your form. Could you let us know few submissions where you have noted this 1-hour difference in the selected time? You can let us know the submission IDs (here is how you can get the submission ID: https://www.jotform.com/help/549-where-to-find-the-submission-id)

Also, are you getting this different time on the email or the form submission page?

we're getting the incorrect time on both the email and submission page. Here are a couple submission IDs in which the time has been changed to a time that's not an available appointment and one that is incorrect. It now appears all the recent appointment times are being changed to 1 hour before the actual requested time.
4919031689987531691
4919835100307119248
4919773340941698948
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Sorry for the inconvenience.

I cleared your form cache on our end. Could you please check it again and see if the issue still persists?

Our developers fixed the issue with the appointment field with daylight savings time. Please try submitting a test submission and let us know if the issue still persists. We'll wait for your response. Thank you!