If you are moving, your GPS starts reporting COG that makes sense and the course up chart orientation starts to make sense as well.
If you are not moving and have GPS connected and producing nonsense COG data, course up makes no sense and "issues" like what you mention are more than likely to happen.
Without GPS connected, all the chart orientation modes look like north up as there is no course information coming from anywhere.
Switching between chart orientation modes can be performed any time by single
clicks on the small GPS toolbar in the top right corner of the OpenCPN window.
Do not use course up mode when you are not moving. Course up mode is also extremely unpractical for route
planning in my personal opinion, moving or not.