When you go into a server with the one probe it doesn't display the IVS and the EVs display weirdly.
Server:

The One Probe on the left and HWYLA in the middle. (The one probe displays the exactly same without hwyla installed just have it installed as a work around for right now.)

SIngleplayer:

Here's it in singleplayer where it displays it correctly

This is not a bug, it was by design as I was unable to get the information to the client via TOP.
This should be fixed in the 1.16.5 version of the mod.