Moldy? Psh, that's nothing. The real excitement begins when you play with the sweat coming off the dynamite, like we did back when I was a kid in the 80s!
Note: the above is sarcasm. "Sweating" or "weeping" dynamite is dangerous and you should immediately leave the area and contact your local equivalent of 'the bomb squad' to report it.
Over time, regardless of the sorbent used, sticks of dynamite will "weep" or "sweat" nitroglycerin, which can then pool in the bottom of the box or storage area. For that reason, explosive manuals recommend the repeated turning over of boxes of dynamite in storage. Crystals will form on the outside of the sticks, causing them to be even more sensitive to shock, friction, and temperature. Therefore, while the risk of an explosion without the use of a blasting cap is minimal for fresh dynamite, old dynamite is dangerous.
Note: the above is sarcasm. "Sweating" or "weeping" dynamite is dangerous and you should immediately leave the area and contact your local equivalent of 'the bomb squad' to report it.