103% increase. The number of people leaving increased by a factor of 1+1.03 = 2.03. Which is to say, the number of people leaving more than doubled, which would have been a better title, but either way there is nothing wrong with math in the title per se.
depends on how you contextualize it. Biden only won PA by 80,555 votes in 2020. In that context 60,000 voter registration flips to republican is a lot.