Yes. The problem seems the load balancing. For example:
pinging from pc1 to 10.10.208.2 the pc use wan1 (or wan2) not gateway 10.10.208.1.
I think router needs a mangle entry to bypass odd/even marking. (remeber that I use a persistent load balancing schema like described in http://wiki.mikrotik.com/wiki/Load_Balancing_Persistent )