Shiny keys

Dear Community,

I have a new MacBook Pro 15'with TouchBar, bought in February, 1st. After a month of normal daily use and proper cleaning, just as suggested by Apple, the most used keys of my keyboard, mainly the space bar, A, S and letters have lost their matte finish and a shiny spot has appeared. Is this normal? I am aware that fingers can polish and remove the finish of the keys but I thought this process was going to be evident after 6 months or a year, not this fast.

Any suggestions?

Regards,

Alessio