Ok so it's probably just residual bubbles from mixing.
How often have you been feeding since the mishap? You probably have a lower % of starter than you think, which means it will take the yeast longer to work. Additionally if you're feeding because you don't see any activity, you just reduced the % starter even more. Sometimes you need to be patient and let the yeast do their thing.
65* is too cold, try to get it to 70+ by putting it on top of your hot water heater, or fridge, or other warm area... and be patient!