Issue while Concatenating TXT Files

I hope you're all doing well.

I have a simple command-line prompt that I use on Windows to concatenate all TXT files into one file named "merged."

copy *txt merged.txt

However, I've encountered an issue where, in the merged file, on the second row, two barcodes are placed next to each other on one line. Ideally, "11073-18216,28" should be on one line, and "11073-6185,12" should be on the next line. Does anyone know why this might be happening?

Attached below are 3 txt files for convenience.Thanks a lot

https://files.fm/u/6pzku5mst4