Something else I noticed is the open ends are not consistent in size.
The 14mm looks almost lobsterish and the 10mm looks thin. The 19, 16, 14, 11 are larger than the next size up.
Snap-on are very close to scale dimensionally as sizes increase.
Some lower quality manufacturers will use the same forging die for multiple sizes and the result is wider jaws and yoke on the open end and thicker walls on the box end. This was my biggest complaint with a Tekton set I was able to handle and examine.
Here is a Snap-on SOEX set I personally own. Notice how the wrenches are basically to scale as they change size.
And that is even with different years of production which is common for their sets, versus the OP's set which all had the same date code. To me, that is another red flag.
I will post the OP's picture to compare.
With the overwhelming evidence, I am going with these are counterfeit.