Looks to me like water in the gas / oil mixture. I don't have that issue as I use non corn gas pre mixed in the container at 50-1, aka: Echo Red Armor or Tru-Fuel, but then I'm an occasional user and not a heavy user. One thing I do like about canned fuel is the extended time it stays viable. I even use it when I over winter my seasonal engines. I drain out the corn gas and replace it with a bit of canned fuel and run them for a time before letting them sit for the winter, They always start right up in the spring, no issue. No 'gunked up. carbs ever.
You can buy Tru-Fuel without any 2 stroke oil mixed in if you so desire. Not applicable with Red Armor however.