First of all, I specialize in Pepsi-Cola on-the-spot adjustment. In this case (carbon dioxide gas and cola puree), all the coke syrup is produced, which means that the water source is cut off. Answer finished. Check the water source. There is gas in the gas cylinder because carbon dioxide gas was added to the syrup when it was bottled, as you said.

Coke machine's canned coke is not added, or there is little carbon dioxide added.

Moreover, the concentration of cola in coke machine is low, and the concentration of canned cola is lower than that of non-canned cola.

And there will be more water in many places.

One concentration will be lower, and the other will run a little more even if it is angry when opening the can.

Of course, basically, coke from coke machine won't have gas, and it is impossible to have it.

The problem has been solved and can be adopted.