What method did you use to initially learn the characters? If you just used Anki, I could see your result as making sense.
I used Heisig's Remembering the Hanzi to learn the characters and then would practice them in a space repetition system. A few years later I can still write most of them. His method has you create a story and make mental image associations for each character. Eventually you forget the stories over time, but the character usually sticks.
I used Heisig's Remembering the Hanzi to learn the characters and then would practice them in a space repetition system. A few years later I can still write most of them. His method has you create a story and make mental image associations for each character. Eventually you forget the stories over time, but the character usually sticks.