What might cause a plant to do this?

[Sinn]

in this case i would suggest that you get cheap microscope like this one 
 

 
i bought it from aliexpress for only $2.80 USD.   with this microscope attached to iPhone,  i can see mites, whitefly lava, thrips, ... blah blah
it's a MUST HAVE gadget.
 

Nice would you mind sending me a link to those please? Thanks [emoji41]


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[lek]

Nice would you mind sending me a link to those please? Thanks [emoji41]


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Here it is:
 
https://www.aliexpress.com/item/Universal-Mobile-Phone-Microscope-Macro-Lens-60X-Optical-Zoom-Magnifier-Micro-Camera-Clip-LED-Lenses-For/32645626675.html
 
Unbelievable price!!!

 

[slickyboyboo]

My MOAs are doing the same thing. Both are in different potting mixes and get different nutrients. Neither one is even remotely close to each other and none of my other peppers have this curling. Other than the odd leaves mine are doing fine.

That's exactly what I'm seeing. Plant is doing great, and dropping a bunch of blooms, and appears to be very healthy. The reaper next to has no leaf issues.

 

[lek]

That's exactly what I'm seeing. Plant is doing great, and dropping a bunch of blooms, and appears to be very healthy. The reaper next to has no leaf issues.
 

 
don't let your guard down against bugs!    who know it could be the beginning of infestation.  get microscope and take a look at both side of the leaves with red circle.
 
do you use tap water, rain water or something else?