Though I objected to Icon concerning his argument, I'd think that the scorecard is correct for WGTland. Apparently OAK#17 is considered straight, because the front pin distance equals the scorecard length, 244 from red (single hole play). From there, it's about 20 paces to the back pin, corresponding to your observation.
Generally, there may be a difference between scorecard and pin distance. It's the rule for OLY, MER and PIN which have a different measuring philosophy.
You should hover over the blue dot next time you're there or use the marker in reverse green view to sort it out.