Do you just have the microfibre inserts? Mine would never have lasted one wee with those inserts, some kids do but some kids wee lots
It sounds like they re getting saturated and then the wee is squeezing back out or wicking onto clothes/ bedding.
It also may depend how long you leave between changes, most cloth needs to be changed every 2-3 hours.
I ve used BG s successfully with the addition of a bamboo/ hemp booster in underneath the large microfibre booster. I would have to change every 2- 2 1/2 hours. I would also push the inserts away from the edge of the leg holes / crotch after putting the nappy on to avoid wicking.
Hope that helps!