is my employer giving me less pension?

im looking at my ねんきん定期便 and i see that 標準報酬月額 is 650 万円 per month and my 保険料納付額 is 59475 yen.

I thought the 標準報酬月額 should be around my salary? my actual base salary基本給, before tax, exluding bonus is several hundreds of thousands more than that. So why am I in such a low bracket not reflecting my actual salary? Is it correct or is my employer just trying to pay less pension for me?