Oversized packets between N2048 and N4064F

I've set up a link between a N2048 (Tengigabitethernet 1/0/2) and  a N4064F (Tengigabitethernet 1/0/48) with a DELL DAC. These two switch are configured with MTU set to 9216 on each switch.

But on the 2 ports involved in this link I get a lot of :

On the N2048

# show interfaces counters tengigabitethernet 1/0/2

Received packets dropped > MTU: ............... 303283
Transmitted packets dropped > MTU: ............ 155494

On the N4064F:

#show interfaces counters Tengigabitethernet 1/0/48

Received packets dropped > MTU: ............... 147596
Transmitted packets dropped > MTU: ............ 221817

I do not understand why this occure as MTU is the same for the 2 switchs. Any idea ?

Thanks

Patrick