Hey man, if you really made sure nothing is eating your plant (cats usually tend to enjoy the leaves quite much) it looks a lot like it has been damaged when it was forming. Maybe you accidentally damaged it without noticing when you were bending down the branches?
Just keep an eye on the new growth, if the new leaves are fine I wouldnt worry about it.
Definitely nothing to do with water, temperature, nutes or anything.
Hope I could help, cheers dude.