I don’t understand where you take the 1 Tbs = 2 tsp equivalent from. From what I see (at least on the left glass), it says 1 Tbs = 4 tsp (the “one”being on the very left). From there it counts up. So only the first Tbs is divided into 4 tsp. The little “2” on the right side of the bracket reads - with the “one” above as “1/2” to me, which in turn is 2 tsp …
I think one could easily verify by filling water up to the different measures and weight the whole thing …