Unable to Reorder resources dataset

In the edit page of datasets there is the possibility to reorder the created resources. I am able create the order by dragging and dropping, but when I click on ‘Save order’ the message ‘Saving…’ is shown indefinitely:

Seems that the uris of the resources are not set:

I tried both Safari and Chrome and neither worked. After refreshing the page the order isn’t saved. Is it possible to fix this?