Extreme clipping in CE5

while trying to master a song recently, i noticed that whenever i try to use a multiband compressor (specicifically the plektron comp4) in the chain, there’s an ungodly amout of clipping to the output when it’s on. any suggestions, and i apologise in advance for this - it’s probably something really simple - because i only started trying to master in cubase this past couple of days ago.

Do you use Control Room?

Essential does not have the control room :wink:
(Given that CE 5 means Cubase Essential 5 - I really love it, when people post proper system specs.)