Help for Aimeos

Hi,
when someone already went through checkout and saw the confirmation page, but then goes back to change the basket, and then again to checkout, then the steps "Address", "Delivery" and "Payment" are skipped, and the user is directly led to the confirmation page. If he then wants to make his order an error message is shown, saying that the delievery method is missing.
How can we fix that?
Is it the best to tell aimeos always to go to the first tab ("Address")? How can I do that?
Thanks for help.

Aimeos: 19.10.9
TYPO3: 8.7.32
PHP: 7.2.34

You can disable the Autofill plugin to avoid skipping any steps.

That does not help. Still, after changing basket it goes straight to the summary page.