Sometimes, when you select an entry in a Gallery which takes you to another screen with Form and Gallery controls where Item is set to Gallery.Selected, PowerApps will display the wrong record in the related controls. My observation is that that a fraction of a second later it changes to the correct record, and this occurs on the 2nd time or more (not the first time you open the app). In other words, you select a record, submit or cancel, go back to the gallery screen and select another record, and the previous record appears for a second or less (maybe more with a poor internet connection). The issue might be related to the timing of the click/tap in the Gallery (has the screen fully refreshed).
Furthermore, users are complaining that they are getting to the point where they fill out the form, and the wrong record is updated (not sure how to verify this).
Any ideas on keeping this from happening? One, never seeing the previous record for that short time, and two, keeping the wrong record from being updated (is this even possible?)