You are in a hurry trying to perform SDS-PAGE for your independent research project so you can get out of the lab and lay out by the pool. In your haste, you grab an old aliquot of 6x loading buffer that is over a year old. Your gel seems to run normal and you add the GelCode Blue to your gel and go bask in the sun for an hour while the gel stains. When you come back to observe it, you see that in addition to the 30 kDa band you expect, you also see a band near 60 kDa. What do you think might have happened