Usually means they are too concentrated. All things being equal water always wants to move from less salty area to more salty area, and so when there is a quick high dose of salt whooshing through a system with nothing to dilute it like your last few recent meals, water from around your GI tract will tend to migrate quickly into your GI tract. So now the salt is diluted but that much water is going to want to go somewhere and that somewhere is out your butt.
One solution is to take whatever your dose is and add more water to dilute it, then take the dose broken up over a couple of glasses of water over time. Or using less.