Let's use VBA to update each GROUP sheet each time you look at it.
On the attached workbook right-click the GROUP A sheet tab and select VIEW CODE, you'll find this event code:
Now compare that to the event code in the other two sheet modules, you'll see the parts highlighted in red are the only difference so it copies the correct columns over.
Also, on the Master Sheet, I removed the color banding you had manually applied and replaced with a conditional formatting that colors the EVEN rows blue. This way when it copies random rows to the other sheets the color banding works on the other sheets, too.
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