It seems if you have a 16 PM, it's more likely you won't have the issue.
Apparently Jun at RL says this was designed on purpose this way. I don't really think the gap was, but I think the bigger port size was. Seems the PM must have more room without creating a gap. I have been chatting with Jun, and has said twice that there is not a fit issue even after seeing the pictures. Take that how you will. They have amazing customer service, so I am exploring what else they can offer me. For me that's a deal breaker for a case. I own both the black and saddle brown open bottom cases from them and have no issues at all with those cases. I think they choose the wrong option by making the port bigger.
Edit: An update, Jun did make it right for me. So I will still wholeheartedly stand with RYAN London. If you have any issues, they will look out for you.