Just in case you hadn't noticed, after ResDiary's last release, you can now over-ride the Table Capacity for future services and future dates. This is especially usually in Asia, where #restaurants are generally configured to seat Western people, but in fact these tables are often occupied by many smaller Asian people, giving you even more scope to boost business.
When we over-ride a table's capacity, ResDiary creates a secret "phantom" table and a secret join. The Join is only temporary and deleted after use. The Phantom table exists in your Diary settings as it has reservation data against it. We hope to filter out all these phantom tables from your view very shortly.