Drawing with left hand being right handed

I was just making some sketches, and I thought about a pose, it was perfect on my brain tried to make it, and it didn't came right. So I gave up. Later on, I was bored, and told myself "let's try to draw this with my left hand", and I was surprised with the result, and I thought "man, wow, is my brain hiding something from me?" So I tried to draw that pose with my left hand again... And it came out perfect! Of course, the lines aren't so great, but, it was exactly what I was imagining and I couldn't make with my right hand...
Someone can explain why this happens?
Someone already experienced this before???