I noticed this when looking at our updates from visiting Oregon and Washington. This would be in Astoria, where US 101 Business ties back into US 101 on the northern end. For one short segment, the business route overlay with OR202. But, OR202's point at US 101 does not actually join with it. I copied the coordinates and there is a slight variation once you get to the 4th decimal place.
US101BusAst w/ US101 (Connects) - Coords.: 46.182936°, -123.860743°
OR202 w/ US101 (Doesn't Connect) - Coords.: 46.182891°, -123.860807°
Mike