multisite and plugin probs

various problems with this site since i took over!!!
1. limit blogs per user not working even though it is set to 1 blog. In the ‘my site’ section they can still create several blogs.

2. cets_blog topics not giving option of topics on signup.

3. Edit tagline plugin not showing on signup.

when you intially register and create a blog these options do not appear, but when you go to the ‘my site’ and ‘create a blog’ (which you should not be able to do) you get the option to edit tagline and select blog topics!!!!