Just to answer about the pump thing- the cleanliness has nothing to do with it if the pump messes up. It's how it's put back together AFTER its cleaned/sometimes if a pump gets heavy use within a day some pieces come loose and it messes up. These issues aren't always visible either, and one only catches it if they do an iced drink with normal amounts of pumps and they see exactly how full the bottom is, and go "hmmm that doesn't look normal. Must be getting a little bit over/under when I pump the syrup than usual", and that will strongly affect taste. If its during peak, everyone is moving at 200mph so we are less likely to notice that until it slows down and someone orders the right drink and we see it and correct it.

No sometimes the wrong pump is used. We have different ones for mocha and white mocha as they are thicker and require a different size pump. If the white mocha pump was accidentally put together instead of the chai, it would be putting more chai in the drink because it has a wider gauge

I was actually trained not to put water in my chais, but I learned at my new store we don’t do dat