Maybe I don't have this issue because I wear lower rise shorts? Where is the bunching? The only issue i have with skorts or baggies that have a separate liner is that the shorts often times have a higher waist than the outer part (skort or baggies), which is why I look for liners or shorts that are low waisted.
It's been so long since I wore anything that actually sits on my waist, that I find it extremely uncomfortable.
2015 Trek Silque SSL
Specialized Oura
2011 Guru Praemio
Specialized Oura
2017 Specialized Ariel Sport