And if anyone can explain how to attach a pic from my phone to this thread, I’d be happy to show proof that this happened.
Upload the picture to an image hosting site (Google will easily find you a plethora of free to use ones). Afterwhich you will then have a URL to use for the BBCode to link the image.
Dice only have positive numbers on them. So how can this happen?
It shouldn't. All dice rolls are positive integers. It's only modifiers that can be negative.
So either something bugged out, or some negative modifiers were still being applied to your initial die roll.