What an odd thing to have happen so often.
At a glance, a lot of your symptoms sound like bacterial infections I've seen in young cornsnakes.
Sadly with anything like salmonella, it's difficult to say where the bacteria is originating. Reptiles are known to regularly carry salmonella.
You may have an entire colony harboring that strain of bacteria and are possibly reinfecting the ones who are more heavily infected if you haven't treated all of the animals. The other possibility is that they were fed rodents that are carrying the strain as well. If it's a particular breeder you're receiving your rodents from, that can be in issue as well.
Otherwise, I'm going to piggyback on what Nikkubus mentioned about feeding. Over the years, I've seen a few things with feeding that can cause those kind of stools.
1. temps are on the hot side and the snakes are not properly metabolizing the meal.
2. Powerfeeding too large of a meal or too many meals too close together
3. feeding too close to a shed. Some animals metabolize much differently when in shed compared to others.
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