New lodge cast iron pan brown colour

Your seasoning is uneven. Possibly because of the very pitted rough-cast nature of modern cast iron pans. It looks like your oil has been more attracted to itself than the pan surface.
DIY seasoning isn't evenly black to start with. It's brown. The black comes with time & repeated re-heats.

You could see if several repeated coats will eventually smooth out - seasoning is not done in one go, it's done over several repetitions using the absolute minimum of oil each time.

I'm at a loss as to why you considered it necessary to remove the professional quality seasoning provided by the manufacturer to save you have to go through this yourself. It does fortunately look like you weren't totally successful in removing all the existing seasoning, or your first DIY coat would have been spotted brown over silver-grey.