[BUG?] Ignition 8.0.16-RC1 - view Canvas relative position applied only for the first instances

Ignition 8.0.16-RC1 - perspective

I use a viewCanvas

Instance are created with a script as follow:

...
instance = {}					
instance["position"]="relative"
instance["top"]="10px"
instance["left"]="auto"
instance["bottom"]="auto"
instance["right"]="auto"
instance["zIndex"]="auto"
instance["width"]="auto"
instance["height"]="auto"
instance["viewPath"]=template
instance["viewParams"]=parameters
instance["style"]={"classes": ""}
instances.append(instance)

10px are only applied for the first instances but not beetween instances ?
is it a bug or I missed something ?

As for the manual:

For position relative, the view is placed within the canvas placed in the normal document flow and then offset by its top, left values. This is the same with left and right.Options are relative or absolute. Default is absolute.