some lighting problems

Was starting off with tutorial video but i noticed that i got lighting problem noticeable from this screenshot (http://i.imgur.com/vfQDWcV.png), it’s a flash-light increasing the contrast and then going lower and doing same thing for thousands of times without stopping like wtf is happening, is there a way to make this stuff delete?

anyone pls? can’t figure out that problem

no feedback! ;(