Help needed with malformed radiotap headers

Hi,
        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 . The attached screen-shows the
problem.

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

Could anyone help me out with this?

Regards,
Anand.