Mephisto Alien VS Triangle

Had some strange markings on the leaves this week as seen in photos. Not 100% what they are. It's not nute burn because the majority of the leaves are fine, but a number of them have started showing this burn. Looks like a contact burn but nothing has been close to the light. The leaf is just sort of wilting at the tip and on a few leaves showing burn along the side. Thought it could be K def so gave a slight PK boost. Bud sites have started forming a little bit this week. Not sure they're going to be the biggest nugs but they look to be quite dense and frosty. Looking for quality this round.