What are “reordered” fragments?
If the received fragment or packet does not match the expected sequence number, then the reordered counter is incremented. For varying packet sizes, this is bound to happen. For fixed size packets, this can also happen because the PA driver processes the packets that received on one link and does not go at round-robin basis (as is done in dMLP while transmitting the packets). Reordered does not mean packet loss.