Prolly the yeast. What your possibly tasting is phenolic flavours
https://www.winning-homebrew.com/off-flavors.html
"PHENOLIC FLAVORS IN BEER are most often described as clovey, spicey,
smokey, band-aid-like, or medicinal. Except in a few beer styles where some of these flavors are considered appropriate, these compounds are for the most part considered a flaw
Could also be a wild yeast infection
"One of the primary culprits of off flavors attributed to phenolic flavors and aromas are wild yeasts. These wild yeasts will produce many types of phenol compounds, but most of these are not the commonly accepted clove or spicy aromas and flavors, but a strong medicinal band-aid-like flavor which is not pleasant at all"
https://www.winning-homebrew.com/phenolic-flavors.html