Autopilot deviation on approach to BFI

[Lauramks2]

I was flying the RNAV Y rwy 14R with autopilot engaged. When it got to LEMNN, instead of turning toward COLMT it flew straight and lined up on the extended runway centerline. Approach was normal from there. Why did it do this? 
The image below shows me past LEMNN headed to the dashed rwy centerline. 

[Pils]

What version are you using?

[Lauramks2]

I was flying the 650 v 1.7 and didn't realize it. I switched to the 650 1.8 and flew it again and it still does the same thing. At Lemnn it goes for runway centerline. 

 

[Pils]

Ok. Thanks for checking. I guess this misbehaviour got carried over to 1.8 by accident. There'll be another update coming at some point "soon".

[Lauramks2]

This only has happened on that one approach so far. As I fly around I will see if it happens again. I will also try some of the other BFI approaches to see if it is just this airport.