Sry i meant after I disable the plugin and re-enable it. I have the default values and haven´t set any other presets. I tested it a little more:
Loading Plugin -> tessellation OK ->disable and re-enable tessellation individualy -> tessellation OK-> disable and re-enable the plugin ->...
For me, when I reload the plugin, the detail is less pronounced with tessellation. I can see this clearly when I enable the debug view. The solution is to disable and re-enable tessellation individually. It could be a bug, or only for me?!