It does make sense. There is actually very little active compound in each vial and the filler makes up almost everything you see. Because of that the finished pucks all look pretty much the same no matter the listed strength so you cannot tell them apart just by looking.
Can I ask if ordering the same product but in a higher listed amount means four times as much powder should be in the vial or if the amount stays the same. A friend bought some and the visible quantity looks identical so she messaged the seller with no reply. I wonder if the strength of the compound itself might be different.