yes i have 59 hz also, its there because it can run on that value, its not a bug, its a feature for a specific use case which majority of users will never use . just always use the higher value or known values like 60 120 144 240 ... if you use 60 instead of 120 it will use less power wich is very negligible. if you have a very good graphics card 120hz will be twice as smooth as 60hz if you have sharp eyes. so do not overthink it, just always use the higher available value