i’ve always wondered what would happen

this has been happening at my cafe recently, but weve been doing the correct ratio of hot water to mocha. i just dont know whats happening. my best guess, our store's AC isnt working correctly and we're in the middle of a heat wave so our cafe is routinely at 80 degrees. maybe its somehow evaporating the water out of the mocha and leaving us with brownie batter? its very frustrating.