Why does a fragment overlap with another?

Question

Android

Good afternoon. Sometimes I overlap one fragment with another. I haven't been able to pinpoint the cause yet. How can this be processed?
Maybe it's because I call getFragmentManager wherever necessary, but I need to initialize it at the beginning of the fragment's life cycle? And so I do replace or popBackStack everywhere. Often this error is reproduced when I switch from some fragment to another using the side menu, for example, calling:

fragmentManager.popBackStack(null, FragmentManager.POP_BACK_STACK_INCLUSIVE);
            fragmentManager.beginTransaction()
                    .replace(R.id.contentMain, new SettingsFragment())
                    .commit();

Answer 1

popBackStack()
popBackStackImmediate()

Like popBackStack(String, int), but performs the operation immediately inside of the call. This is like calling executePendingTransactions() afterwards without forcing the start of postponed Transactions.