confusion????

I don't know what to believe. My old regular old scale says I have lost 22 pounds. My new scale that I bought last night (digital) says I have only lost 4.... it also keeps jumping around throughtout the day. I understand weight varies through the day but that is normally 1-2 pounds. not 4. I put joshua on both scales and they both say 36 pounds. But they are completely different with me. What do I believe? I will see what the scale at the surgeon's office says monday. That will be 2 weeks down. (start of week 3)