Need help! Pen tool paths disappear when they fall within the bounding box of another path, but not always.
Hello!
I've only had Illustrator for a few days and I've managed to fumble my way through some basic stuff, but I can't figure this one out. I'm using windows/PC and have a monthly subscription so I have the latest updates, version, etc.
I need to create line drawings of boots and bindings for a owners manual project I'm working on.
Using the pen tool, I traced the boots. I can see there are paths I've drawn that aren't showing. I realized this early in the process so I tried creating layers for each path I traced, but the same thing happened. So, I did the entire trace on a single layer.
I'm guessing/hoping there is a setting I just need to switch off/on that will make the lines appear. I've spent several hours searching online and looking through all the menus and troubleshooting, etc but I can't figure it out.
Can someone please tell me what I need to do?
Thanks!
Below is what I see.

Here are some examples of what I've drawn that is somehow missing from the completed drawing:


