RTE Tooltip : application issue

Im using the package from the below link :

http://experience-aem.blogspot.com/2019/04/aem-65-touch-ui-rte-rich-text-editor-structured-content-plugin-creating-tooltips.html

I noticed when my RTE has only 1 word and nothing else, like:

training

then, if I apply a tooltip to the word and save the dialog.

Next, I add another word/sentence to the existing word

training experience Fragment

I noticed that the tooltip is getting applied to the entire sentence. And if I try to apply a new tooltip to another word in that existing sentence, the tooltip detail of the first word shows up. How do I fix this?