At this stage to me it doesn't really seem like theres a huge problem here but if i had to put my finger on a few points - Check your pH in the soil if its possible, otherwise try flushing your plant with correct pH.
the lower burnt tips of the plant looks like early on-set of a potassium deficiency.
The abnormal thick growth could also be a Boron deficiency.
Check this out: https://www.growweedeasy.com/cannabis-plant-problems
Happy growing.
💚