I'm having a problem with my chest growth and strength improvements, and now this... I have a weird line separating my upper and lower pecs. When I flex, it looks like 2 muscles, not a flat chest. The indented line travels from my collarbone bone and across to my armpit area. Wish I could show a picture but im pretty hairy so I can't get a good picture. Is this a common thing or am I a whackjob?

Ps. I posted this question here because I figure it must be in my lifting technique causing irregular growth or some crap. I don't know tho...