Powerapps repeating Table- Gallery keeps patching old data

[Anonymous]

I followed the Shane Young video series on creating repeating table functionality using galleries and collections however I am facing an issue. The problem is that when a users needs to edit the form ,specifically the repeating table section, when the user enters new data and submits, the old and new data are shown on the display form but the old data is showing as duplicated. My questions are 

1) IS there a way to update the collection data and not create duplicate old entries?

2) is there a way to delete the old data from the list and replace it with new data?

Please let me know if more information is needed. 

[Anonymous]

The user needs to be able to update the collection over a period of time and when they make update the collection is taking the old updates with the new updates. 

I didn't mean to accept as a solution.

[WarrenBelz]

@Anonymous ,

But you are clearing the collection. Also a collection only exists during the Power Apps "session". Are you wanting to store some user data somewhere?

[Anonymous]

The collection is only being cleared when a new form is created I just want to update the collection with new info only.