Plugins not showing in plugins list

I have a network of sites. I have installed some plugins and network activated some of them. One is the WPMU Membership and another is the WPMU Popup plugin. They do not appear in my list of plugins in my site dashboard. See these images:
<img src="http://afb.euronline.eu/wp-content/uploads/2014/11/1271.png">
<img src="http://afb.euronline.eu/wp-content/uploads/2014/11/788.png">
<img src="http://afb.euronline.eu/wp-content/uploads/2014/11/7881.png">