OP here. As some people were commenting, Scala and excel I guess have some false positives which reflect the unusual popularity. I did try to limit the search to exact word, but think that I overlooked that part. I will try fix the code and update the skills chart soon. Thanks for pointing it out.

Edit: I fixed the false positives using a word boundary on regex "\\bword\\b". The data now seems little sane, will keep looking for any false positives. updated the data and regenerated the chart using new data.