[brazen1]

It means sometimes alternate advice works too. Instead of using a player like MPC and entering refresh rates in its settings, use madVR exclusively and turn it off elsewhere for madVR player(s) used.

I have a native 2160p display I use for everything including 1080p 3D. Far too many times I see users suggesting to use players to control resolution switching instead of madVR. This is usually to work around other problems and in turn create even more problems except the one at hand. Furthermore, less experienced users don't match refresh rates at all and then we read complaints about judder. How many times have you seen an OSD screenshot playing 23.976 video and rendering at 60Hz with a 120Hz or higher display? Still others suggest to enter all the refresh rates a display handles instead of just the native highest which creates even more problems. For example, entering a bunch of 1080 resolutions when you are scaling everything to 2160 in the first place.

Thus my statement you clipped a bit "Match refresh rates using madVR for all resolutions in 2160p only".
This because the OP has a native 2160p display and I suggested to let madVR do all the scaling since it's been foolproof for me for years using a lot of diverse sources.
In that case I use these and only these and only entered in madVR for its comparable players aka "Match refresh rates using madVR". I have never run into a problem and again with lots of diverse titles.
2160p23, 2160p24, 2160p25, 2160p30, 2160p50, 2160p59, 2160p60 aka "all resolutions in 2160p only".

Now if your display is not native 2160p unlike mine and the OP's which are, I suppose you would use a completely different set of resolution values and begin working around your true problem. Same goes if you have 3D problems that require 1080p values or HDMI 2.0 vs 1.4 junk capability devices and so on. Fwiw, I also suggest 'whitelisting' these and only these values in Kodi for the times you use its internal VideoPlayer instead of a madVR player since madVR will NOT be controlling the internal player since it is not a madVR related player. If I'm not mistaken, only Kodi v.18 offers these values allowing casual use converting HDR to SDR be possible without side affects such as postage stamping.