The devils is probably in the rounding. When it says 1g, it’s probably .5G or lower and they just round up. That would explain the discrepancy. Anytime they’re talking about a single gram, there’s bound to be all kinds of rounding errors.
It’s a rounding issue. Check this calculator.
https://thepercentagecalculator.net/dv/calculate-percent-daily-value-for-saturated-fat.html