That is strange, it should be filtered from tags, I feel like something might be conflicting there, I'm not sure.
You can actually turn off the the term descriptions here, to only display the tag names: https://i.imgur.com/444ayyJ.png
With a custom code, it is possible to place a prefix to the tag results as well. Add this custom code to the functions.php in your theme/child theme directory (copy from line 3 only!). Before editing, please make sure to have a full site back-up just in case!
Change the $prefix variable to whatever you want the product tags to be prefixed.Best,
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