As TD7 finding, the weight input from origin only 2 boxes instead of 3. As matching each package,
box no.1 is correct (39x39x23) however, the length of box no.2 and 3 are 1.35 & 1.57 cm not match with UT2 input (80 cm) so it might caused discrepancy.
In summary the weight input is missing one box that make weight discrepancy.