I built a header to install into a bearing wall so I could create a pass through in the wall. My header is a sandwich of 2 - 6ft sections of 2" x 12" with 1/2" plywood glued and nailed between them. I let the header sit for 24 hours before I installed it. I am now starting to see some horizontal cracks in one of the 2" x 12". When I installed it, the header fit really snuggly between the top of the jack studs and the top plate. I am wondering now if it fit too snug. Is cracking common or should I start over?