Spam comments has started to appear

Hi!

Thanks for a great plugin, but 2 months ago my site suddenly started to let spam comments through. I get aprox 1 comment/2 days now (seems to increase slowly), so it’s not a great volume, however annoying to have to manually flag them as spam/trash.

Any ideas why this is happening?

Screenshot of comments I have removed;
https://iloapp.happyhiker.se/data/_gallery/public/0/152689868039607800_resized.jpg

The comments are only on blog posts.
cheers

The page I need help with: [log in to see the link]