Plugin missing node-list in Management

I’ve made a new plugin and I want 2 nodes for different settings. But somehow the node-list user control is missing so the Detailed user control fills up behind the smaller list. I’ve compared 2 plugins and I cannot find the setting that changes this.

It’s worth mentioning that I create the 2 settings-nodes programmatically in Init() of the item manager class.

Fixed it by changing all Guid’s in the Definition class. Must’ve been something buggy with the plugin-configuration on the server.