Same thing I noticed in Cubase Pro 10.
To be sure of the plug in version go find the DLL whih is usually in Vst plugins folder in Program Files. Right click on the DLL /properties/details tab where you’ll see correct version listed.
In my case I get 1.0.0.0 for Stylus RMX in the plugin interface and 1.9.6.0 in DLL file properties.