While doing a mission on Uranus earlier, I noticed some VERY weird procs happening with my guns. My Dex Sybaris only has viral on it, but I was seeing corrosive and radiation somehow coming off of it.
Dex Sybaris build aka proof of no corrosive (Riven has no elementals):
The same thing was happening with my secondary Pandero. It has corrosive and heat on it, but I was still seeing radiation procs.
I even saw radiation coming off of Octavia's MALLE