Sankaku Channel/

What is it with this bad gateway/gateway error problem that keeps showing up on the site from time to time?

How will I clean up ambiguous tags that way? 3:

Also, for some reason the tag cattleya affirms to have only one post despite having 7.

Update: I removed 3 posts and now the cattleya tag has -2 posts. I removed all posts and now the tag has -6 posts.