I am having a bit of trouble of Illustrator, I do not know if things that are happening are caused by me checking an option or anything else.
All of anchor points of rectangles and circles are aligned, and lie on each other perfectly.
Now the problem come when I use either Shape builder tool or pathfinder tool:
Paths become ragged. Anchor points move themselves for no known reason when I merge objects, and it makes it impossible for me to continue to merge or delete some elements.
The truth is I've never worked with Shape Builder Tool before so I could be doing something terribly wrong, so please if you know what's the problem it would be a great help to me!