Why is it, when I split a polyline feature in ArcGIS Desktop, that the part of the feature above the split point disappears?
Video of it happening: https://i.stack.imgur.com/oQyNn.jpg
I think the line is multipart line feature. To solve the problem, you need to explode the line by selecting the line and click on Explode Multipart Feature exists on advance editing toolbar. After that you can use split tool if needed.