I'm still very new to the workings of chipmunks, so may be wrong, but would giving your static shapes an elacticity ('e' property I think) value of more than 0.0 (i.e. 0.5) solve it?
In my test environment I have balls bouncing of static shapes, both the static and active objects have an 'e' value of more than 0.0.
Hope (but doubt) this helps.
had a look and if one object has a 0.0 elasticity then no bounce occurs (in my project at least), but it looks like 1 of your static shapes does have an elasticity of 0.6 so you should be bouncing off of that wall.