Why do apps from the play store get moved back to internal storage after update I've got a good amount of apps installed on my phone's internal storage and I've moved the majority of them (anything taking up more than 15MB) to my SD card. My Android version is Lollipop now. After each update they get moved back to my device's internal storage, but In older versions of Android they would stay on the SD card. 

Would it be possible to force the apps to stay on the SD card even after they update? Or is the only way to stop them from moving to never update them?
If it's system applications then what ever you update or download will be automatically moved to internal storage. 
If it's not the reason then check your play store storage.