i had PG flip tf out about the same thing about 7 years ago. i had no overstay history, so that's not it. in my case, the supervisor backed her up and i ended up missing my flight. and, yeah, whereas TG has never asked me for proof of return ticket, PG always does (learned that lesson the hard way too). when i was 1K i'd just book a dummy TG return (i rarely know how long i'll be somewhere).
used to love PG, but not so much these days. looking at a flight today (which is why i ended up searching FT for them)- found a good fare- well, not really.... once flights selected, it went up 170% above the advertised fare due to 'taxes' (mostly YQ). at that point, makes more sense to fly MH to help get back to low level OW status.