If you are still facing an issue, please validate your xlsform here. It should help you identify the syntax error that is present in your xlsform.
If you are still not able to solve the issue, please feel free to share the xlsform with the community. The community would be happy to solve your issue.
Yes, i could also upload them without any issue here. At the same time, i could also upload them without any issue in the HHI server as well as the OCHA server hosted by KoBoToolbox.