Overfill

I’m standing in front watching the cycler doing drain 5 of 5 and it’s showing a drain volume of 3065 mL. My fill volume os only 2400 mL so the cycler left behind ~500 mL on the fourth drain. I’ve seen a drain volume as high as ~3400 mL before. I’m sleeping ok on PD but most of the time is this overfill that wakes me up and then I have to do a manual drain on the cycler. I think the catheter is in a non-optimal position when I’m lying down for compete draining so I have to sit or stand to get all the fluid out.