Malformed radiotap header in wireshark and background noise parameter missing

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I have set up an experiment to measure Wireless communication parameters using two laptops. I am injecting custom packets into the network on a monitor interface using one laptop programmed as a transmitter(Macbook Pro using Broadcom BCM 4331 interface card) and another laptop ( Dell Latitude E6410 using the Intel Corporation Centrino Ultimate-N 6300 interface card) programmed as a receiver sniffs the network for the custom injected packets and reports parameters such as Received signal strength, propagation delay etc... The transmission is working fine and i am able to get the injected packets on the receiving side.

However , When i use Wireshark to analyze the incoming packets using the monitor interface created using airmon-ng, the radio tap header seems to be malformed. This is the same for all packets .

Also why is the Noise parameter now shown in the radio tap details?

Could anyone help me out with this?