I have run a few test queries, and I believe you are reffering to these: https://i.imgur.com/BuSI2Hk.png
That should not look like that at all. The source tells, that these are h1 and h3 tags, but those should be stripped by default.
If you don’t want the product tag results at all, then you can turn them off here: https://i.imgur.com/8CpBPCs.png
If you need those in the results, then one possible cause of the unstripped tags could be, that they might be allowed. On the Advanced Options -> Content panel, make sure this option is empty: https://i.imgur.com/m0SuOf6.png
This should remove all possible tags, and keep the text only.
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