The idea is to select suitable combination. But, if selected knife, one of any fruit and one of any veggies, don't return salad its a bug. Same goes on mixer + water + any fruit = fruit juice.
Then is bug witch confuse me because why the scripts runs fine on my comp and don't run correctly on others? I even doing tests or re-downloading the game after uploaded, to do one more test if its working.
Are you using Windows or android? I tested this app on Windows 10 64x and on Motorola android.