The barcodes on invoices seem to print ok. It doesn't have to be the invoice number, I tried changing customer name to a barcode and it does the same thing on the second label. It does this regardless if I print to the zebra label printer, Xerox laser, or pdf. You can tell by looking at it on the print preview screen as well. The incorrect barcode is noticeably longer that the correct one (no scanner required to see). We print 1 label per page. I'm assuming by printing to different printers that the driver is not the problem. I have also tried 3 different Code39Azalea barcode fonts. Here is a link to my sample.
https://drive.google.com/open?id=1Lsbw-ecULg_3eBPCGVIdMxd40JVq6zzt

Doug