Dahlia leaves curling. Help!

This is my 3rd year doing dahlias. I've never seen them do this before
I'm in Canada in zone 3a-4a (depending on the year) so I start my tubers in doors early in pots. they were doing beautifully and all at the same time, 8 different plants started curling. There are no pests, they've been fertilized, and watered regularly. They get the sunniest spot in the house. I cant move them outdoors for at least a month and I'm worried they wont make it. today I will repot them in a better soil to see if that helps.

Any ideas?

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