A small wet spot in my master bedroom on my left side of bed

get up on the roof and look real good all over.  the tinyest crack that you have to look for to find in the sealant can cause this.  I just went through this in the summer, sealed up what I thought was the leak, and redid a bunch of extra, then it happened again a week later during a rain, the only thing I could find was a faint crack in the trim moulding calk so I forced new stuff into the crack and its gone.  as for musty, if it is musty it has been happening for a while and just hasn't presented it self till now