I kept having issues like this, with a different kinds of videos, until I scrubbed my history of any of the kinds of videos I did not want.
If I click on something I thought I would want to watch and it is the kind of video I do not want recommended to me I immediately delete it from my watch history, block the channel, and some times block that profile from viewing my youtube channel.
~2 years ago I never had to delete anything from my watch history and my feed/recommendations were ok, now I have to if I do not want my feed/recommendations to occasionally be flooded with something I do not want.
If I click on something I thought I would want to watch and it is the kind of video I do not want recommended to me I immediately delete it from my watch history, block the channel, and some times block that profile from viewing my youtube channel.
~2 years ago I never had to delete anything from my watch history and my feed/recommendations were ok, now I have to if I do not want my feed/recommendations to occasionally be flooded with something I do not want.