1) When i select edges and fill rectangular, i get this awkward result in illustrator. I cant fill rectangular with pink color. What is reason and how can i fix it? [rectangular image is for example. actual problem is about my work. i can't share it]
2) Is it about line continuity? How can i make disrupted lines curvature continious? (second image)
What have you already tried? I would first try to switch from GPU preview to CPU view with [Ctrl]+[E]. If that doesn't help, I would close Illustrator, restart the computer and try again. Only then would it be time for further steps - if they are still necessary.