Is my plant re-vegging?

At your current temperature, your relative humidity (RH) is too low. It should be between 60% and 65%. Alternatively, you could lower the temperature in your grow box. Your plant is not in re-vegetation.

I think it's heat, genetics or both. Pretty sure those single blade leaves were suppose to be sugar leaves.

It doesn’t look like it is re-vegging, rather foxtailing. This could be caused by numerous things. Heat, too close to the light source, genetics, over matured, or a combination of these. I don’t see a diary so it hard to pinpoint.