Seems I had a little misunderstanding with how this annotative scale works.

The scales didn't exist hence '_XREF's were created.

I thought if I add '1:100' then '1:100_XREF' will disappear automatically or synchronize or smthg.

Figured out all I had to do was change the name of the new scales created..haha

Thanks for the help @cadffm and @maxim_k !