Welcome to the ODK forum, @Cakoth! We're glad you're here. When you get a chance, please introduce yourself on this forum thread. I'd also encourage you to add a picture as your avatar because it helps build community!
It's not clear to me what you are asking.
- Can you share the XLSForm file?
- Is the issue when you are filling out the form? There may be an error in your survey logic (when defining the parameters).
- Is the issue when viewing the submitted data on Central? That is, the submitted surveys are missing data from fields that were completed when filling out the form?