[noggin]

It is CSI Miami :-)
Now it is running at 60Hz at the TV and 59.94 at NSTV.
But it was the same when I tested the NSTV was locked at 50Hz at the setup (android), now it is set to automatic/recommended.
But sill, NSTV and Kodi should change the refresh rate it self?

Kodi will only change refresh rates automatically if you have it enabled in the Player settings (Adjust refresh rate on start/stop) and on more recent versions of Kodi you often have to whitelist the refresh rates and resolutions you want output (this option may only be visible in advanced/expert settings)  

However your DVD is i25 (aka 50i), and is likely to be carrying content shot at p23.976 sped up to p25 (as is usual for US TV shows released on i25 DVDs or broadcast on i25/p50 TV stations across Europe). This means it should be output at 1080p50 or 720p50 for decent quality (which is also how it would be broadcast on a 720p50 broadcast outlet)