New Grower Can't recognize what this marking is.

[Sillycybin]

Just saw this yesterday and now it's on a newer leaf today. Don't have any clue what kind of deficiency or burn this is. Anybody know or seen this pattern before?

 

[Jackson]

Gonna need more information than this. How old is ur plant?

 

[Sillycybin]

It is 72 days old. Grown in ffof. She's had issues ever since flowering. Her leaves were yellowing and falling off in the older undergrowth. I flushed her and thought it was a phosphorus deficiency. Have been feeding her alternately ph'd water and cutback nute feed at 1.5ml to 3L's. Now her tips on her newer growth is showing nute burn. She's a mystery to me. But she keeps on putting on bid weight so I don't get it.