Hi @Boon-1 ,
Do you mean that the Display form could not display correct record selected from your Gallery sometimes?
Please consider take a try with the following workaround:
Set the OnSelect property of the ">" icon in your Gallery to following:
Navigate(DetailScreen, ScreenTransition.Fade, {IdentifierValue: ThisItem.PrimaryColumn})
Within your Detail Screen, set the Item property of the Display form to following:
LookUp('Your Data Source', PrimaryColumn = IdentifierValue)
Note: The PrimaryColumn represents the Primary Key column in your data source, which could identify one record uniquely. If your data source is a SP List, the Primary Key column may be "ID".
Please try above solution, check if the issue is solved.
Best regards,