That's the way it has been with IE since XP Pro 64 bit was released. The 64 bit version is there, but due to no Flash support for 64 bit IE, it's not fully functional.
But you still can use it, one good thing, no ads!
Where you will run into problems running 64 bit IE is when viewing video, or any site that requires Flash. But for simple web browsing, it works fine. No need to be concerned at all.
Cat