From what I understand with plants, it actually is a strengthener for them to move like that.

They stretching and compression of the various cells is helpful in making sure everything is strong in the plant and allows it to be more flexible in surviving different situations.

An uplifted plant is a happy plant. A droopy plant is a sad plant. Generally, that is. Some are made to always be droopy, tho I doubt any cannabis will be that way ever - just not in it's nature to be happy yet droopy!

My babes are lifted up to the light whenever the sun is directly on them. When it's ambient sunlight, they flatten out to get as much as they can (light shade situation). Totally normal for baby/younger plants, especially. Older ones won't as much because of less flexability with their stems, though some types of plants always will.