My Listing Brand name changed without my autorization. Please help

Hi,

I have a Listing that I created and it has 6 variations. Out of those 6 Variations 3 Variations have suddenly brand name changed to 3 different names. I created the listing myself . I am not enrolled in a brand registry yet.

But I had this listing for more than a year now and I have been selling all the 6 variations but suddenly this change has kicked 3 variations out of the variation table and now those 3 listing are separate individual listing.

Can anyone tell me why this has happened and what can I do to fix it please ?