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Thanks for responding to my question. The potting mix is homemade with peat moss, compost and perlite. I've been using my homemade potting mix for years and I've never had this issue. The potting mix is recycled from last year year and also used it for other seedlings this year and they've all had the same issue. I use fish fertiliser but I don't think I've used it on these plants.

I only noticed other plants that I had in the same area prior to starting the seedlings had white areas with white spots and also shiny areas on leaves as well.

The soil mix looks really wet, so it could be from over watering. You shouldn't have used recycled mix, and drenching them with so many different things probably didn't help either. Seeds don't need a potting mix with peat and compost, they need a soilless mix. Seedlings will survive from the nutrients in the seed until they get their second set of true leaves and can be transplanted. I think you should get some new seed starting mix and start over. Also, be sure to clean your pots really well before planting in them. You could try gently transplanting some those seedlings that have their first set of true leaves into some fresh, clean potting soil and see what happens. Good luck !

you are probably better off starting over. Any fertilizer in the starting mix can be problematic for newly germinated seedlings.

Curling deformed leaves could be from aminopyralid in your compost. Did you bring in any compost, animal manure, hay, or straw into your compost?