1. You will need to enable slider to show on homepage, also there need to be slider created with alias name what you need to put in the options menu.
Please see pictures to see what you need to do to enable slider on your homepage.
2. When you edit page with content manager on the right side there are 3 items to move, edit and delete rows, if this row is in the section the section will move as you drag and drop them.
3. Yes this sometimes can happen, but you can ignore this, because everything working as intended, whatever you are in visual, text or content manager. I’m not recommending using all 3 the same time it can cause problem as it not intended the all work at same time.