BreadstickRaven said:
Any suggestions on how to fix this?

separate blacklist entries are meant to be on separate lines.

tag1 tag2
will hide posts that contain both tags

will hide posts that contain either tags

if your blacklist is indeed set up correctly it's possible that you somehow disabled your blacklist, on desktop this should appear in the top left of any of the /post pages on mobile it will be near the bottom, just after all of the images.

also make sure you didn't accidentally misspell anything, or include any special characters the site might misinterpret as part of the tag.