There was a district in Philadelpia which saw more votes than eligible voters. Double voting, immigrants illegally voting, fraud, and undercount are all possible contributors. But it was just one precinct. But it also served as an example.
Name the precinct, or give a source, please. I would believe a precint of 20 voters or so with 100% turnout. I don't believe a big one, with even 95%. And, I've looked at the Philly returns, both ward and precinct, and couldn't see any sign of anything close. But if you can cite the specific instance, I'd be glad to check it or be corrected.