22lb discrepency? Issue w/ Taylor brand scale anyone?

I recently purchased a Taylor brand scale/ body fat for $39.99 at target. When I weighed myself, it read 138 lbs which shocked me because it was way less than I was expecting. Skeptical, I stopped into my gym and used their old school sliding bar scale which gave me 159 and their electronic scale which gave 160. I'm wondering if anyone else has noticed such a huge error with the Taylor brand or if this particular scale is somehow damaged. I'm trying to figure out if I should exchange it or find another brand. Thoughts?