When you scanned a receipt you got the notice that it is already registered. That is on purpose: every electronic invoice is unique, and facturillo does not add it twice so your totals do not get inflated with duplicates. The receipt is not lost, you already have it.
Why it happens
Every electronic invoice in Panama has a unique CUFE that identifies it. When you scan a receipt that is already in your account, facturillo recognizes that code and tells you instead of duplicating it. The most common cause is rescanning a receipt that was still processing, thinking it will be added faster that way. There is no need: the receipt was already on its way.
From the «already registered» notice you can tap View receipt to go straight to the one you already have, or Close to keep scanning others.
If it is a family or business receipt
If the receipt is already in your family or business account, the notice tells you and offers to view it in that account. It is counted once there, you do not need to add it again in your personal account.
Tip
If you thought it was a different receipt, compare the merchant, the date, and the number: two purchases on the same day at the same store can look alike, but each receipt has its own CUFE.