funky nute burn???

ive got 1 plant out of 12 that has 2 leaves that are like that. ive been running the nutes a bit high (1000 PPM on GH nutes), but thats the only plant that is showing anything like that. and they are on different nodes aswell. one leaf is on node 1 and the other is on node 4. my PH stays from 5.8 to 6.0. if it is nute burn can yall think of any reasons that it is happening to 1 out 12 plants, and only 2 leaves on different nodes?

maybe heat stress? dunno, ive had leaves look like that here and there and i havent worried myself about them.

na cant be heat my roon is temp controled at 80. the prob just worked its self out on yours?