Angle measure incorrect: grasshopper

Hello everyone! I am trying to measure the angle between the edges adjacent to the green point shown in the picture above. I am using the compute angle between vectors tool, and I specified the plane in which I want to measure the angles as well. The problem is I keep getting a result which states that the angle is much smaller than 90 degrees but I can clearly see it is an obtuse angle. Why is it giving me a wrong measurement and how do I fix this?

Check the direction of the vectors: is one perhaps pointing towards the green point and one away from it?