Unroll any curled up leaves and inspect carefully for a pale green quick moving little worm. Probably will be some silk on the underside/inside of the curled leaf. Little bugger may be out feeding...so check under other leaves too.

If there is no worm and no silk... Then I am stumped. That would likely be viral or fungal...but how and why!? Idk.

And I dont think there are any viruses...maybe not any fungals that would go through such a variety of crops as you described from last year.

Don't giveup though. Our gardens are our places of solituded and regeneration!

Peace