I believe that it is a possibility for them to be allergic to the aspen bedding. That or it is too dusty for them. I have two piggies and one of them sneezes when i use aspen bedding, but the other is perfectly fine. I hope that it isn't anything more serious than needing to buy a different type of bedding.
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You can use it but if you go to pet stores you'll see that they use something called carefree usually, and that what I use for my guinea. Pine and aspen wont really harm your pig but it messes us there nose and irritates there respiratory system, that's what the petsmart and petco people told me so if I were you I'd use carefree.