Spacing errors

I have several chapters, each with Times New Roman 12, 1.5 spacing. I have at least one of those chapters that seems to have 2 or more spacing yet the header indicates 1.5. I tried to change it to 1 then back to 1.5 but it remains the same larger spacing. What am I missing? Every other chapter is fine.

Discovered that the format settings for this one document was set with a different value. Line height had a value greater than 0 in it and so that threw off the spacing for me. Hope that helps someone else.