HI @Kumar9024021 ,
Which form do you add within your app? Is it a Edit form or a Display form?
Do you create a standalone canvas app based on your SP List or customize a custom form app in your SP List?
Which browser do you use to run your app? Have you taken a try with other different browsers?
Based on the needs that you mentioned, I have made a test on my side, and don't have the issue that you mentioned. Please make sure the DataSource property of the Edit form set to your SP List as below:
[@'YourSPList']
Set the DefaultMode property of the Edit form to following:
FormMode.New
If the issue still exists, please consider re-generate a new app based on your SP List, then check if the issue is solved. More details about generating app based on SP List, please refer to the following article:
https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/app-from-sharepoint
In additional, please also consider take a try with the following workaround:
Set the OnVisible property of current screen to following:
NewForm(EditForm1)
set the DefaultMode property of the Edit form to following:
FormMode.Edit
then save and re-load your app, check if the issue is fixed.
Best regards,
