The stop laying, start laying, because it's hot, is kind of normal. That smells like chicken thing, did one of them push out it's V jay jay

??
They will arrange the straw in the nesting box the way they want it, they get broody / moody sometimes and will redecorate... it's what wimmin do!

Id not worry about it too much but with that make sure you dig down a bit in it, you can re distribute it if you want, to make sure there are no eggs buried you overlooked.
Aaron
Edit: that's not really a lot of hay to begin with, they are just trying to make some padding for their eggs to rest on I'd think.