Yes, you should correct it. This should be easy to do as I have suggested many times.
If you don't, you will have substandard Colloidal Silver and not be able to able to judge ppm.
Member gandolf demonstrated what happens with low voltage, and confirmed my statements.
First, you should verify that your sodium carbonate solution is correct. It should be 10.6 grams per 100ml of water.
Second, adjust your voltage by raising your electrodes, especially your negative electrode, and turn off the polarity switching.