What do you mean? I still see production icons. They're right under the top banner... looks like the numbers are 3 4 2.
I can see what he's saying. Here's a better image...
On the Improved Hunting, the 1/2 is written over two pots (the income symbol), which are in turn over a light/dark pair of disks.
However, on the Improved Mining, the 3/4 is written directly onto the light/dark pair of disks. The pots are missing.
Having said that, I'm not sure which one is the mistake and which one is the intended version! Having the disks showing more clearly makes it a lot clearer as to why there are two numbers there, but having the pots is more consistent with the other tiles.