Barcode generator library's examples do not scan?

The scanner I’m using is a 1D barcode scanner and works with the EAN13 barcodes (great examples given here EAN-13 free barcode generator with bar width reduction (vector PDF, AI, EPS))

However, it doesn’t scan any of the barcodes generated using GitHub - tecnickcom/tc-lib-barcode: PHP library to generate linear and bidimensional barcodes, not even their example barcodes provided, so I scratched off the possibility of my printer/scanner/code being the issue.

Has anybody used this library before to help me figure out what the problem is?

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