Wrong, that is why AG has a guide stickied, that actually have a "Help! I lost xAP!" section.
It should probably be elaborated on, though.
Someone might have deleted your comments on their profile, either because they wanted to clean up a bit, or they were feeling malicious and hate people having AP.
Or AG is glitchy, a thread have disappeared into the Armogamial Triangle.
Just.... Assume you need to write longer comments and posts and move on. It could be anything, but it is usually somehow, one way or another, your own fault.