Old index marks in text are not being removed when rebuilding index table thus create a new mark every time the index is updated.
This bug of not clearing the index marks in the text from the previous selection of ‘update index’ before adding additional index marks when selecting ‘update index’.
It would be very helpful to be able to delete ALL occurrences of a single word index mark instead of selecting delete for every occurrence and repeating that step thousands of times. Bugzilla – Bug 103630