Have you contracted TABS?

Sometimes you just didn't know how to format your file so you did this:
tab
tab, tab, tab, tab
tab, tab, tab, tab, tab, tab, tab, tab, tab, tab, tab
tab
Or you converted your file from Scrivener.
Or their origin is a mystery.

This file has contracted TABS

This looks bad to editors. Also, if you're self-publishing, random tabs can cause formatting migraines.