Text underline display line above text instead of below

As showing the given image After applying underline decoration text style to the text it shows line above text instead of below in flutter 2.2.

 TextButton(
              onPressed: () {},
              child: Text(
                getLocalValue(context, txtTermsNConditions),
                style: TextStyle(
                    fontSize: 12.sp,
                    fontWeight: fwMedium,
                    color: Color(clrPrimary),
                    decoration: TextDecoration.underline),
              ),
            )

That was a problem with fonts I have used, using another font it has been resolved.