MacBook Pro not connecting to 5Ghz wifi signals at 36, 40, 44 and 48 Channels

I would tend to agree with John Galt.

My MacBook Pro is a UK model aka Great Britain and my System Report lists it as Country Code GB with a different list of frequencies.

One possibility is that the country code and frequencies are linked not to the country of manufacture and supply but the the region setting in System Preferences. I would however normally expect it to be what market it was intended to be shipped to. If for example you bought it in the US direct from Apple and specified a delivery address in Pakistan Apple may have programmed it for Pakistan.

Different countries do have legal requirements for different frequencies aka channels.

The information you really need is that Mac's Part Number. If you have its original packaging, receipt, order, or other paperwork it might be shown on them, but then again it might not. That information is not available from System Information, on the Mac, or anywhere else.

What is that Mac's exact Model Identifier please. To determine it, use the same System Information you provided earlier. Its Model Identifier is shown under Hardware Overview. Unfortunately it will not reveal the reason its AirPort card thinks it's in Pakistan, but it may provide a clue.

As John Lockwood noted wireless cards (like any other RF-producing equipment) must comply with regulations that vary from one country to another.

... I have told that sometimes, it is displaying a long list of supported channels and connects to this router.

I understand. That Mac may connect to that router, but the information you posted clearly indicated those specific channels are not supported.

Your model Mac does not support those channels. It was built for the Pakistan market (PK) while your router was built for the EU market.