looks like the top bundle on the bottom pallet. this is common as suppliers sometimes stack pallets of shingles too high, and for various reasons such as overstock, lack of storage area, etc. and its not so much “warm weather” that is needed as plenty of sunshine will do the trick. for example, on a 90 degree day your shingles could be as hot as 140-150 degrees to the touch, so if it were 40 degrees the surface of your roof could be 80 degrees by 2 pm, provided its been sunny all day. however, i would keep an eye on the 5 or 6 shingles that look like they have been compromised due to overstacking as they may need replaced if they do not lay down with the rest. i install shingles in cold weather, however, i also place my materials in the homeowners garage or build an enclosure using tarps and heat shingles with a torpedo heater before installing. sounds like a pain in the neck from a contractors point of view, but it is worth it, after all, you aren’t proud of the appearance of your roof, and as your contractor i wouldn’t be proud of it either. it would cost probably cost no more than 200 to have what could be a hand full of shingles replaced, so i would withhold that amt from the contractor just incase.