New cast iron has gotten strange color
There is a very good chance that the spacing of the markings is the same as the grate on your oven.  (at least the ones on the right side).

The left one I'm not too sure about -- it might've been something like an oven thermometer, or just where you touched it as you were loading it into the oven.

When this happens your best option I've found is to repeat the seasoning, but with the pan right-side up this time.  You'll want to make sure that you've wiped up as much oil as you can from the working area of the pan ... otherwise you'll get a thicker coating that's more likely to scrape off with use.