Hi Joan,
None of your posts were ever removed. The problem registering, logging in etc, was a site issue here and admin of Agoracom posted a note that the registration system was down temporarily, in fact many members were blocked out from posting for a while, it was a sporadic and at times geographical issue as well.
The password system had a bug during this glitch, not letting long-standing posters to participate, thus these codes being used.
I checked your post history just now and all of them are there.
Open this link: https://agoracom.com/members/-Sq9MDF5_47-/post_history
If you have anymore problems, email here for help: contact@agoracom.com
Hope this answers your concerns.
Joe