Rear drum cylinder leak?

I just put brand new cylinders and hardware on the rear drums of my 69 dart and I was puting on the bumper tonight and noticed some brake fluid on the tire. Checked the bleeder valve and line in connection and completely dry. So my only guess is the cylinder leaked a little?
The brake pedal is still strong with pressure and not spongey.... Any suggestions on what to tighten or look for? All brake hardware and cylinders are Doorman products from Summit.

All comments and suggestions are appreciated!