Weird test results

So I had my glucose test done and my blood work all came back perfect. I had an appointment with my OB yesterday and they tested my urine and it came back +4 sugar which is extremely high! I made sure I didn't eat anything with high sugar before I went! She has no idea why I passed my bloodwork and my urine is still showing high sugar! So confused! Going to keep an eye on it and I will be going back in a couple weeks