You may just be seeing the difference between a plasma display and a more modern display type - plasmas were always particularly good at handling motion compared to other types of display. That’s a consequence of the way plasma displays handle pixel brightness: other displays set a pixel to a particular brightness level and keep it at that level for the full duration of each frame; but on a plasma, a pixel can only be either at full brightness or completely off, and a pixel is “dimmed” by having it switched on only for a short period, and then off for the rest of the frame.
Some TVs have a “black frame insertion” feature which allows you to insert a period of darkness between frames - that can improve the perceived quality of moving objects, at the cost of making the picture less bright (and sometimes introducing visible flicker).
As Sam says, it’s also worth checking the TV’s settings to make sure you don’t have any kind of motion or frame interpolation going on. If your TV has a “filmmaker mode” that will probably turn interpolation off. Or alternatively look for an option under Picture Settings called “Intelligent Frame Creation” and try turning that off.
(Incidentally, having the television rather than the Vero 4K doing the upscaling can be a good idea; but I doubt that has anything to do with the problem you’re talking about. If you want to experiment with this, check out my whitelist guide: [HowTo] Guide to the Kodi whitelist function and related settings . But the default settings on the Vero mean that both 1080p and 4K are output at native resolution; so, if there is a scaling issue, it will only be affecting videos with a resolution below 1080p.)