Why hightlights in some saved files (pdf) in zotero come with note symbols and some do not

As I say in the title, why did this (Zotero 6.0.36) happen in my second Windows PC (Win 11) but this is not the case in the older Win 10 PC? I find those note symbols a bit distracting. Is there a way that I did not come across and that we can get rid of them?

1) in one article
https://s3.amazonaws.com/zotero.org/images/forums/u9754444/huiivk14qw6lw9cfhoyu.png
2) in another article
https://s3.amazonaws.com/zotero.org/images/forums/u9754444/uy4hz3pi8qwc9t86zlh3.png
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