Pennsylvania

But perhaps the Republican voters (AKA Repukes) are less likely to request mail-in ballots than the Democratic voters. The County Board of Elections only prints enough ballots to fill requests, so it's not going to be a large number.

The coding error happened on the Republican primary ballots, and it wasn't on all of them, just a certain number. Each precinct and each district has different candidates. (So yes the ballots were printed in small batches.) Somehow the coding error happened because nobody checked the ballots before they were mailed out. (My guess anyway)

If the printer was given incorrect info, it's not their fault that the ballots were incorrect. If the County Elections Board signed the proofs and they are incorrect, well how can the printer be blamed? If NOBODY checked or signed the proofs, then SOMEBODY is in deep shit.