I am sorry the game does not work in browser, are you saying you purchased something in the shop and the seeds per second counter did not increase?
One thing I feel is not clear is what each item does. The yellow cars increase your seeds per second, the bags increase the seeds per click, the red can increases the speed of the auto clickers, and the watering can will give you seeds every 1-10 seconds. I will try to make what each item does clearer in the future.