Sprites acting like shadows

[Tristan Lasalle <tristan.lasalle AT gmail.com>]

Hi everybody,

I would like to get some help on (a bug ?) something I found in my graph : 

I draw a graph with two nodes and I added a sprite on the edge linking those two nodes.

Whenever I move one of my two node it seems like the sprite is not following my edge so it put a shadow on the graph. 

But, if I click wherever in my graph, the shadow disappear and the sprite appear again under my edge ?

Do you have any trick to solve this problem ?

Thanks in advance for your help.

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Cordialement,

Tristan LASALLE