i had to remove the rear derailleur in order for me to do something else.
and now that i installed the rear derailleur, it looks pretty good.
One of 2 problem is that the rear derailleur pulley and the large cog don't match in a straight line. But the small cog matches with the pulley. Other problem is that the derailleur wiggles left and right when looking from behind.

i need to fix this help