Why do my seedlings have purple stems

My seedlings just sprouted I live in Florida so it's not really cold I used verm perlite and some organic potting soil is this normal ? Ill try to post pictures later cause I don't know how to do it off my phone
Oh also some more purple than others I used publix distilled water and purified drinking water

Some strains when coming from seed have that anomaly. Some are red. Ive noticed it goes away after the first true leaf set forms not the cotyledons. Thats just based on my experiences.

I had that also mostly on feminized seeds

I get blue stems if I water too much. I'm color blind so it could be purple...

I believe its a PH imbalance