Null value inside 80MHz packet

[Phon1209]

In case that heatmap contains blank space (null value) does that mean the frame is 20MHz or 40MHz instead of 80MHz?
To get this heatmap, I captured on channel 36 with 80 MHz using Raspberry PI (using mcp -c 36/80 -C 1 -N 1)

Also when I tried to capture on channel 44 instead, it seems the data is misaligned. Is this considered normal?

[Asafe33]

Can you explain more? What is the solution?