The - symbol usually denotes a negative value, so that's probably right. Hard to tell with the limited information.
What in particular is the concern? You want it to strip off the negative on the numerics? Use ABS(<value>) to Absolute it as a positive. I'd personally be leery of doing this as you'll miss inversions, but if you're sure of your data go for it.
Never stop learning, even if it hurts. Ego bruises are practically mandatory as you learn unless you've never risked enough to make a mistake.
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