Annotation added on the wrong highlighted text when the text appears multiple times

[3iren]

For context, I use annotator to make notes on my lecture slides, and sometimes when the same word appears multiple times, the note I add gets added to a different slide that has that same word on it. For example:

Bulletpoint in slide 1: Two possible mirror image chiral structures, are called enantiomers (e.g. hands). Glyceraldehyde (3C) has 2 enantiomers.
Title in slide 4: Enantionmers

I'm trying to add the note to the word "Enantiomers" in slide 4, but the note keeps getting added to "enantiomers" in slide 1.

Unrelated, but additionally as a suggestion would it be possible to annotate images?