Hi,
The given information is not useful information about the problem.
If your circuit does not work as good as the datasheet specifies, there basically are two sources
* either the datasheet specification is wrong
* or your application is not designed according datasheet recommendations.
Indeed there may be datasheet errors, but don't expect it.
Thus focus on
your application. Showing a datasheet schematic does not help to find the problem.
==> Show us exactly your schematic, your PCB layout, your power supply, your wiring, your measurement values, your expectations.
Your given schematic does not show the problem ... it shows how you want to cure the problem.
but somehow it cause common mode noise problem and current readings are different then expected.
* common mode noise
The ADC has differential inputs. Common mode noise should be cancelled out.
Thus I rather think your problem is not "common mode noise"
* current readings
I don't know your expectation, nor do I see your reading values. So I'm not able to find out whether your expectation is wrong, and whether the readings are within or outside specified range.
From the given information I can not find out whether there is a DC problem, a low frequency, problem, a high frequency problem, an accuracy problem....
Klaus