Never seen anything like this before, but this is my first time growing Jock Horror. Started with the main cola then moved to the rest of the cola leaves moving down the plant. In the pics the edges look white but they are actually yellow, with a tiny bit of brown tips but very little brown. Using all organic nutes, this started prob about a 4-8 days after a flush and fresh organic nutes added. No Problems with my other plant. ill add more pics if needed.