So the 5 gal of Rotella T6 I purchased only had 4qts in it, and it was completely sealed.So when I poured oil, I left 1qt in the jug assuming there was 5 qts in it. I poured the remaining 1qt and my dipstick is able to read it :). As for how it happened I wish I knew the answer. But the important thing is all is well again.....for now :). Thanks everyone for your feedback and time.