Open api / swagger generator error

i am trying to generate for a vendor open api that has a parameter in the url path.
it gives back errors like this:

The path signature '/rest/projects/{}/pre-billed-labor/{}' MUST be unique.
The path signature '/rest/purchase-orders/{}/items/{}' MUST be unique.
The path signature '/rest/purchase-orders/{}/items/{}' MUST be unique.
Declared path parameter "id" needs to be defined as a path parameter at either the path or operation level

in the swagger pages there is only one "{}" in the url and it needs a value like an id number.

here is the public swagger for it:
https://dev.portal.unanet.io/platform/swagger/

is this a radzen bug or an api issue ??

Can't tell from the provided information. What should we do in order to reproduce the error you are getting? Please provide all details needed.