Hallo Marcel,
ja, das müsste so sein, siehe dazu auch: Creating Search Engine Friendly URLs - Part 1
Starting with FirstSpirit 5.0, "Default URLs (SEO)" was introduced as an additional path generation method. Using the method suffixed with SEO it is possible to benefit from the following, extended functionality.
As stability of URLs is an important factor for ranking in search engines - you want the same content to be accessible at the same URL for the longest period of time - they should remain available even if the website structure changes or the name of the page has changed. The SEO flavoured version thus stores the URL of a page reference when it is first generated.
When generating the page reference a second time, the URL is taken from this storage and not computed again. This means that you can move a page reference within the structure of the Site Store or a media in the Media Store to a different location without getting a new URL to it upon generation.
If you want to reflect the changes made in the URL permanently you have the possibility to explicitly use the "Reset stored URLs" option as a project administrator from the context menu of media, Media Store folders, page references and menu levels. Using this option the URL storage is flushed recursively for the selected elements and a new URL is assembled during the next generation.
An additional benefit of the SEO variant is that SEO URLs and Short URLs, which will be explained in the next article of this series, are taken into account during the generation process.
Ich bin jetzt einfach mal davon ausgegangen, dass du ein Test/Dev-Projekt hast, auf dem man die Umstellung ohne Gefahr einmal ausprobieren und dann die generierten URLs entsprechend abgleichen kann. 
Grüße
Sandro
