document library – Sharepoint Online Site Search

I'm getting 2 different results from 2 search fields in Sharepoint Online. The first image was searched through Find a file in the document library, the second was through Search on this site

search 7220 through finding a file

search through search on this site

Any reason why I do not get the 3 results when I search through Search on this site?

The column Customer number is also indexed