Incorrect Discovery weigh in metrics

I have been going for weigh ins for 3 weeks now and I have just had problems for all 3 of them. The first time I was told the incorrect amount. I also didn't get the full check done as only my weight was the one checked, no height, no waist circumference. The second time I went there and there seemed ok but then I went today and I was disappointed with the metrics. In terms of the weight I wont know whether the problem is on my side or not but all of a sudden my waist circumference jumped 24 cms up from the last measurement. Should I continue even using these services because I don't know what to believe anymore. I cannot make proper progress if my weigh ins are not correct.