How can I correct the "movement" to these Spring Arms? (Or it is a bug?)

Hello all.

I have a simple Pawn.
In this Pawn I have two ChildActors attached with 2 Spring Arms.
When I changed the Target Arm Length all Spring Arms are group towards the center.

I have a Gif to show you what is happening.

Thank you, guys.

=D

305474-springarmbug.gif