Windows Renaming horse everyday

Leier10

Greenhorn
Hi, for some reason, for the first time of everyday that I get on my horse, it prompts me to name it. But the name never saves, it always goes back to "Grover" in the next day. Sorry if the wording is a bit weird.
I don't believe this is a recent bug, as I have been playing like this since many updates ago (maybe more than a year with this bug).
Any ideas?
 
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