Hi @sns ,
Please try to create a new edit form in SharePoint designer and set it as default to check the result.
If the issue still exists, I suggest you create a new list with the same structure in SharePoint server 2016.
If an Answer is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.