weird CANBUS signal shape, different voltages within the same frame?

[Javier1]

Question for the Hardware-wise ones:

When probing canH and canL with my isulated oscilloscope i get the following signal:

different voltage levels inside the same frame??!.

Notice how the ACKs are always higher voltage also

It doesnt happen always but every time is just half frame 600mv difference

 

No idea of what is going on, im using exclusively ifx1050gvio transceiver, the bus has its proper EOL and is about 3m long, populated with 4 nodes and a master.

[Javier1]

The issue was related with bad clocks.

I was using Resonators instead of XTALS. (they proved to be even worse than internal HSI clock)

this was making CANBUS sync to fail specially when ACKing every frame