As per section 51 of the CGST act , Supplying goods to GoVT department or person notified by the GOVT , they will deduct GST TDS , if your taxable supply exceeds 2.5 Lac, so accordingly they have deducted 2% GST TDS , and file GST TDS return in the form of GSTR 7 , same will be reflect in GSTR 2A .
If you have supplied the goods to GoVT department , Confirm from them weather they have filled GSTR7 for TDS deduction or not , also you ask for certificate for TDS deduction for your records .