Collection Records inaccurate

[FrancesB]

Using a checkbox to add items to a collection.

then on second screen displaying collection item list, I am getting blank items also in the collection list.

ie. might select 3 items, get a list of 5items with the 3 items and 2 blank items (total item count = 5)

Actioned clear collection records (which works), to reset.

But same thing happens if I try again.

Check box is set OnCheck formula Collect(CollectionName, ThisItem)

So there's nothing seemingly wrong there.

Just getting blank data in my collection. Noted the blank lines are "False" in the Pressed column.

[EddieE]

@FrancesB 

It's considered Best Practice to test if the item you are adding to the collection already exists, before adding. Eg

If(  
    IsBlank(LookUp(CollectionName, ID = ThisItem.ID)), 
    Collect(colPreHitchAdd, ThisItem)
)

In this example I've used ID as the record identifier but if that isn't available then you will need to use some other key or a combination of keys.

The reason for doing this is because the same record can be added twice, users can inadvertently double-click icons/labels/buttons/etc thereby adding a record twice and good data management.