Hello,
from the URLs above, I can see you are using some plugin or add-on for VM "krediror" that is identified in URL by page=checkout.kreditor;
I am not sure what kind of add-on this is, but the problem might be in URLs it generate.
As we answered already in email, when URL contains 2x option variable, that is certainly wrong.
However, such problem is caused by the component that has generated the original URL, not by JoomSEF.
If you want an individual paid support for this, where we would debug it directly at your site, that is possible. But this problem does not seem to fall withing the JoomSEF support we can provide here on forums.