I've never had a Padron do that to me.It did that to me with other various brands of cigars, Padron, Tat's, etc. So, isn't it unfair to single out RP?
I've had 2 cigars do this to me. One was a Rocky Patel Indian Tabac Maduro and the other was Graycliff 1666. I've often heard this on other cigars like the Nestor Reserve Maduro and Rocky Patel Fusion Maduro. With the Indian Tabac, Nestor Reserve and Old World Reserve you can sort of see a texture to the wrapper, a bit with the Graycliff too. It's kind of blotchy and inconstant throughout.
Typically the way they die cigars is using the juices from the tobacco leafs and brushing them onto the wrapper.
Now it is possible for a cigar that isn't dyed to bleed some of its natural oils when wet, but some of these cigars are so dark you can't help but wonder...
If you want a good Maduro I would go with Padron, Oliva or CAO.