On the blog category page, the full content of every post is listed.
This is a very big problem, because
-there could be a lot of posts
-posts can be long
The fair solution would be if posts would be listed with an introduction of 3-4 sentences and an intro image maybe!
General Support
b2evolution CMS Support Forums
Yes, this is actually a bug in the current release. It will be fixed in the next one.
(btw: the bug only affects top categories, not sub-categories)