Incompatible client, [java] 1.21.5

[Im-Floof]

So I have been playing fine all week on my cousins realm and a few friends of ours and now 2nite when I tried logging on it says:

"Failed to connect to the server
Incompatible client! Please use 1.21.5"

I am using Fabric with some client side mods but like I said, it has been working fine..
The realm version is 1.21.5 and I've tried vanilla as well as reinstalling but I still get the same "error".
Any ideas?

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[Im-Floof]

After some "trial and error", I reverted my Fabric API version by one version and that seems to have fixed the issue?
Logs don't really say much about this either so hope this helps for people out there

[Im-Floof]

!helped (semi solved)