@Lhoust try updating to the latest commit, it looks like it was fixed in b62e803.
Here is the github link if youre intrested in then change (I am)
https://github.com/vatesfr/xen-orchestra/commit/b62e8035fca4e8cefcb2d1465d585342c720b45d#diff-7c35aaf9805ed05fd9c00b9a5ab3ac8a82f479d03331f0bc771002e302763a39R275