Sometimes I equipment a relics such as constitution, equipment doesn't increase maximum health for the first time, and I am always in a state of injury, the second equipment can normal calculation, maximum health and seems everything is normal, then equipment of other related physical properties of belongings, I am the properties of the panel will increase crazy property values.
Screenshots show the same problem with luck.
Sorry for using machine translation

i had this same problem and the forge 1.16.5 version of RelicEx (the mod that adds the stat changing artifacts) is no longer being maintained and has this as a major bug,
i found a way to fix it but it is very long and complicated so a machine translator likely will not give a working description but I'll put it here for anyone else having the same problem and it requires uninstalling the mod

(you need to not have the affected world open for this)
you need to first delete relicex from your mods folder,

then go into your world and unequip every item including artifacts from other mods, armour, weapons, etc.

then you need to close and save the world.

After that you need to go to your saves folder, go to the affected world's folder and find a file called level.dat,

you then need to take this file and put it into an nbt editor (i used NBTExplorer as it is faster but a web based one such as webNBT would also work though can be laggy with something like this) then in the nbt editor you need to go find a file named "Data",

then in that there will be one named "Player", then in that find one named "ForgeCaps", then in that go to "playerex:playerattributes"

then lastly go into "Modifiers". in that should be a bunch of attributes, the ones that have an abnormally high amount of "entries" or things inside of them should be the stats that were wrecked by relicex,

since we are resetting the stats you want to go through every stat in the "Modifiers" folder and delete every entire inside of each stat,

to delete a large number at once in NBTexplorer you can select the the top entry then while holding down shift select the bottom entry and that will select every entry in between,

once you have done this for each stat you need to save in nbtexplorer or download the modified nbt file with webnbt then replace the old one

(you can ignore the level.dat_old file as this is a backup and if you've done nothing wrong it will automatically become identical to level.dat)

then you need to go load up your world again and your stats should be reset,

this will also reset any stats and levels gained in the playerex menu so to reset that you can temporarily turn on commands by opening to lan and setting cheats to on in the open to lan menu

then do the commands /playerex reset then /playerex levelup [amount] with the amount being the amount of legitimate playerex stat levels you remember having,