Minus Front is distorting my image
I am losing my god damn mind with this Minus Front tool.
The first shape below is the one I want to CREATE. The second one is the shape I get after using the Minus Front tool. I'm following a youtube tutorial and the guy is horrible at answering questions. The middle white triangle has been merged with another shape to make an opening at the bottom of the shape. I used the pen tool to make the curved lines on the top and right corners of the black triangle. When I select the entire thing and click Minus Front, I get the second or third picture (I keep getting both things)
How do I get rid of those white arches that are created after
first (what I want):
Second (What I get when I select all and click minus front):

