LM5141: Having a higher ripple then expected

We have used the LM5141 to design a switching regulator which converts an input voltage between 24V and 60V to an output voltage of 5V. We're running some test measurements using a load of 2ohms. When measuring we noticed a ripple of +/- 168mV. I've added the scope images here below. Note however that we used the scope in AC coupled mode so we only see the ripple the same is seen if we did it in DC-coupled mode.

We personally think it's a grounding issue. We have however followed (to our knowledge) all lay-out advises from the datasheet. The circuit as seen below was also created using the WEBENCH tool with the only difference that we picked other MOSFETs which can dissipate more heat. The WEBENCH tool estimated a ripple of 2mV We've tried to increase the output capacitance however this does not fix the issue. Another thing which increases our belief in a grounding issue is the fact that the same ripple is seen on the 3V3 line which is generated from the 5V line though an LDO. Would there be any suggestions to why or how this issue happens/can be solved?