I have these darker stains (very faint though) on the ceiling of my kitchen and living room. The ceiling is not wet, my roof is only a year old. I just recently noticed these stains because they are faint. Went into the attic, took the moisture temp of the wooden beams, and nothing reads above 18, which is good. What do you think these stains are? Cause for alarm, etc.? Attached are some pics. These pictures really make the stains seem worse than they are.