Early flowering during veg cycle

My fem Amnesia haze is flowering at 4-5 weeks into veg cycle. Lights are on 18 hours. Is this normal?

I’ve found that some plants are eager to flower more quickly and have had it happen early, even with photos. Do you happen to have an auto?

I did not order auto and I checked the packaging. The label is Am Haze Fem. These are my first sativas, but they look like an indica 1-2 weeks into flower.