You will have to contact firstname.lastname@example.org or tag @administrators here or the moderator on the Discord server for help. Make sure you have the account names and purchase dates, etc. available for them to be able to help.
@administrators please reset for me as well. Username: lin_ela
@wtowne89 This often happens when there has been an update and players have different versions of the game. Did you check for that?
" it makes me fear that I invested my money with the wrong developpers. "
You are absolutely right !