I noticed the userstyle was being applied globally so it'd also mess with the other websites like Google. Now I have fixed it so it only applies on BLF now. People who are using it may receive an update and if not, try reinstalling the userstyle.
EDIT: So to update you'll have to click the Stylus icon, go to manage and press the update button near the delete button and press the green button in order to install the new updates.