It is not unusual for gliders to go several days without eating much. That is a normal part of their cycle, esp. with females.
If they are eating SOME,then it is not as worrisome as if they are eating nothing at all. If they are just eating a little, that means that they don't want more at the time. Just keep feeding them as normal and you will get a feel for this cycle. Be sure you are not giving too many treats and that you are giving treats in the morning and not in the late afternoon or evening.
Having said that, it is also not unusual for gliders to become disinterested in the BML diet. So, if you find they are eating the fruits and veggies but none of the staple mix, then you might want to consider talking with Bourbon about some changes you can make to make it more palatable to them or switching diet plans.