Not a problem.
Of course the cause for your problem is that Panda3D sorts objects (close/far) before it renders them. Changing the render order by hand is a way to solve your problem, but it’s “ultima ratio” (pun intended). There are half a dozen other ways you can try first. This manual page explains them better than I could do:
http://panda3d.org/manual/index.php/Transparency_and_Blending
enn0x