CoordinateExtractor output identical for first (0) and Last (-1) values for some line features

Look at the geometry vertices: is it possible that the line goes back and forth over itself?

@david_r

Thanks for the suggestion. There's definitely something like that happening, but i'm not sure it's the exact issue. I used the "Feature vertices to points" tool on some of these links in ArcGIS and chose the "Both Ends" option, which should only provide 2 points in output. But my output for each of the links with this issue is 2 start points and one end point (the second start point being where the line intersects with another). Not sure if this has anything to do with the problem, but it seems odd.

I'm going to split all links where they intersect with another line and see if it makes any difference.

@takashi

Thanks for the suggestion. I'm reasonably new to FME.

I have provided the details below. I'm not sure what to make of it in the context of my original question to be honest.

@takashi

I notice that coordinate 2 of Part 0 and coordinate 0 of part 1 are the same. I guess this is where my issue is stemming from.

Is there a transformer which will separate these lines into their individual parts?

@takashi @david_r

thanks for your help guys