The sequence problem should be fixed. Please upgrade to the latest version.
Go to Edit -> Configuration -> Automatic Updates -> Update Source -> Beta -> Save and Close | go to Help -> Check for updates, after the updates completes, restart DbSchema.
The second reply, about the table creation order should also be fixed. DbSchema checks the table order and keeps track about foreign keys.
Can you please provide a sample project where the tables are created in the wrong order ? We couldn't reproduce the problem on our side.