1080p 24hz/frame from Samsung/Panasonic blu - ray players, input into a Onkyo N3007 reciever set to "auto" resolution output gives 1080p 60hz

Hi

 1080p 24hz/frame resolution from Samsung blu - ray player input into a Onkyo reciever which is set to "auto" HDMI resolution output gives 1080p 60hz, when checking status on TV screen (Onkyo reciever displays its sound and display setting on the TV screen).

Is this correct / best setting.

I can force the output (status) to say 1080p 24hz if I select "through" rather than "auto" in HDMI output settings.  If I do this my Philips 21:9 56PFL9954 TV displays 1080p 24hz correctly. Onkyo recievers status displays 1080p 24hz input and 1080p 24hz output on the TV screen over the movie being watched. 

I would have thought that the receiver's "Auto" HDMI output resolution setting would have passed the 1080p 24hz through to the TV. Auto is suppose to automaticly set best resolution for TV (/ convert video resolutions to ones which TV supports), so why is 1080p 24hz from Blu-ray players  (same with samsung & Panasonic players) changed  to 1080p 60hz or is that correct (better).

Regards

Stuart