Stop giving them apple juice.
Apples and apple juice contain natural pectin which can constipate, if they are already constipated it's probably doing more harm than good. Apples are fed to gliders but usually with enough other foods that keeps them regular.
Instead give them fruit n veg with high water content, like cucumbers, watermelon, even a piece of iceberg lettuce.....
Constipation is almost always diet/snack related, I'd almost bet money it's the peanuts.
Peanuts are a source of protein but they pose risks to gliders.
1 Aflatoxin. Peanuts and dried corn or corn based products can produce a specific kind of mold, the mold produces a toxin called aflatoxin. Aflatoxins are deadly to gliders and aren't usually diagnosed until the glider has passed.
2 Constipation. Gliders teeth are not designed to grind nuts and seeds. Their teeth are designed to compress juice from the food they chew then they spit out the solids they can't digest. Nuts and seeds do not break down enough to get fully digested they scrape them with their teeth rather than grind, so they build up and create blockages (impaction) sometimes it requires surgery in severe cases.
3 High in fat. Even though it's a small amount, nuts are high in fat which is hard on internal organs.
Exotic nutrion food.... personally I wouldn't feed anything from that company. The diet hasn't been tested, its full of fillers, gliders fed it are known to be on the heavier side yet always seem hungry.
If they like the "hpw" from there I'd put them on a quality hpw diet Critter Love I'd use
https://www.critterlove.com/what-should-you-feed-your-captive-bred-sugar-glider
It's one of the most widely used diets, it's been tested, isn't full of fillers, easy to make and there are salads that are fed with it. If you contact Critter Love Peggy would be more than happy to send you a sample so you can even try it before you buy it.
When they are on a balanced diet, extra protein ( like peanuts) aren't necessary the protein is already in the staple. If out of staple safer options for protein are:
boiled/baked chicken or turkey
yogurt no artificial sweeteners or low 0fat
scrambled or boiled eggs
**no seasonings, oils or butter when making glider food.