Some people store fat. I was 140 pounds at 6’ and I STILL had a bit of a stomach. I ALSO have a piece of fat on my chin, that don’t go away. I work out and I have beautiful 4 pack abs. You just can’t see those bottom two. I am currently 6’ 195#. I find I look my best after about 8 to 13 hours of not eating. As soon as I drink or eat my stomach bloats.
Look at the waist. You really have to be below 10% or you will have love handles.
Also if you are not measured by the water test your body fat is probably not accurate. Calipers(sp?) are the second best. Scales and bicep testers are not very accurate at all. But can guide you thru changes in body fat