Why is my memory say it is full and empty

So i have this camera and when I want to record it tells me the memory is full but when i go to the memory, it tells me that the memory is empty.

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0