Hi @Anonymous ,
Do you customize a form for your SP list using PowerApps?
Do you mean that the custom form display empty when you review an item in your SP list?
I have made a test on my side, and don't have the issue that you mentioned. The screenshot as below:
Please check if the Item property of the SharePointFom1 has been set to following:
If(
IsBlank(SharePointIntegration.Selected) || IsEmpty(SharePointIntegration.Selected),
First('20190325_case13'),
SharePointIntegration.Selected
)
Also please check if the DataSource property of the SharePointForm1 set to your SP list data source properly.
In addition, please consider take a try to remove the custom form from your SP list, then re-create a new one for it, then try it again, check if the issue is solved.
More details about removing custom form, please check the following article:
https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/customize-list-form#delete-the-custom-form
You could also check and see if the following video would help in your scenario:
https://www.youtube.com/watch?v=Badj3_T8zAw
Best regards,