Need help understanding indentation?

[patrick-nicodemus]

I have used this software for a while but I have always struggled getting it to indent as I expect, and I was wondering if you could please help me to understand the mechanics here and help me to resolve this.

When I hit enter at the end of the last line of the gray region, the cursor is placed at the 27th character, which is below the first space character in (bicat_assoc f g h). The fact that the whole gray region is contiguously colored seems to be a bug because it suggests some grammatical continuity which is not present.

I run into these kinds of indentation errors all the time but I'm not sure how to reproduce it or isolate it. I usually just fiddle around with it and add newlines and try to get it to reset the state until it works, possibly deleting the whole code block to reset the state. Can you help me understand why this happens and how to debug it and isolate the error?