Hi Mario,
I'm attaching your form, reinjected with a newer version of qRules. We'll be releasing a new version in the next few days to address this issue. Thanks for finding it!
To address the more general question: the key is that Refresh needs to be executed at some point in the form's session. The Refresh command can be executed immediately after submit, or on finishedLoading (as you are doing now). As long as the Refresh command executes at some point, then the delete in your form should be carried out on the list as well the next time you submit.
Can you try with this form and let us know if the issue continues? If the resolution is confirmed, let us know and we can send you a new build of qRules.
Thanks.