I had a few encounters with apps corrupting because part of their data was somehow stored into my SD Card. So I decided to move everything back into internal memory, format the SD Card, un-mount it and remove it physically.
However, after removing the SD Card and restarting my phone, I noticed some peculiar behaviour. 3 of my apps immediately started "storing" data into my SD Card, which no longer exists physically. Skype stores 12kb, Messenger 28kb and 9gag 92kb.
I haven't tried re-updating the corrupted apps, not sure if they would try to "store" into the non-existent SD Card as well. Any explanations or knowledge on this behaviour?
EDIT: Adding in more details
I'm using a Samsung Galaxy Note 2, below is a screenshot of my phone a few hours after removing my physical SD Card. The answer below further confuses me, as this "SD CARD" menu accessed through Settings > More > Application Manager was exactly what I used to manage which apps gets moved to the physical SD Card before I removed it. It remains the same after I mounted the SD Card back. Does this mean both emulated SD Card and physical SD Card information are combined in this menu?