My CII model is located on a platform 12m above sea level. according to the metocean report the maximum wave height could reach to 17m. this means my system is somehow exposed to the wave impacts but, it really baffles me when I see no wave influence on the system in the CII results. I wonder if anyone could clarify.

PS I have all the wave and current data double checked and they seem to be correct; as soon as I submerge my system ( bringing it below free water surface 0.00) I begin to see some reaction forces on the supports but, that should be impact of current loads, right?

In general, most wave theories assume "small amplitude waves" in relation to the water depth and structures. Therefore most of the theories ignore anything that happens in the wave crest. CAESAR II does however include the
Stream Function theory as well as modified versions of the Stokes 5th and Airy theories. These will extend water particle action up into the wave crest.

Be aware that CAESAR II is not running the wave past your system. Rather each load case looks at the wave (and any associated current you may define) in one position relative to your system. At that position, an element is either submerged or it is not submerged. For elements that are not submerged there will be no hydrodynamic loads developed. For elements that are submerged the hydrodynamic effects (wave, current, buoyancy) will be developed and applied to the load vector.

All of the loads are based on the water particle velocity and acceleration at the location of the element. There is no accounting for wave slamming or wave breaking (in the wave theories implemented by CAESAR II).