There seems to be some inconsistency when running the same phased invoice template. Why does one produce an invoice with an account summary and another without it? I don’t want an account summary on my invoices.
Account summaries are optional and can be turned off for invoices at the global level and/or project level. It is possible that the phased projects you are trying to invoice might be having different rules set for this option. You can turn off this option by unchecking Account summary on invoices in Global Settings > Billing. This ensures the new projects do not have the rule automatically added. You also need to remove the rule from the projects that already exist. You can do this by using the Actions > Batch Update feature in the Projects screen and turning off this rule for all the selected projects.