Sudden Sugar in urine test. 3 plus!

Respected Doctor's My Dad Age 59 had burning sensation while urinating so he went to urologist before a week,now he is better but the issue is when we went for the Checkup they took urine sample to check sugar it was mentioned as Nil in report and after one week in the review consultation they again took the test its showing sugar 3+ ,so just to reconfirm the issue doctor took full kidney function tests like urea,creatine, blood glucose and hbA1c but all the tests are within reference range/Normal,Only change in his routine is taking antibiotics for possible UTI in-between these two test report I.e one week So the kidney function is normal and blood glucose within normal range ,so what might be the possible cause for this sudden increased sugar in urine ,also his albumin increased to 1plus in latest report I have attached both the lab test report for your kind information second lab test is redone and it again showed sugar 3 plus!!