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It looks like your barcode data is switching from subset C to subset B.
>; is the start code for subset C, which is all numeric values from 0-99.
>6 is the subset C invocation code for subset B, which handles normal alpha/numeric characters.
More information Code 128 subsets can be found on pg. 91 of the ZPL manual.
I'm working my way though that manual, but it's a lot of info, hahahaha.