While texture painting, there is a weird line coming with the brushing which is disturbing the regular flow of the brush(you can see the white line with the brush). Can you tell how to avoid that?

It looks like you have Stabilize Stroke enabled; just un-check that:

ssam05   Either that or you have a line brush enabled. A line brush paints a straight line from where you started your click to where you ended your click.

blanchsb when you set your brush stroke to Line, the preview of that line is dotted, so I don't thinkthat is the case here...

Ahhhhh.... Gotcha. Yup it is Stabilize stroke! spikeyxxx  I am glad they made that differentiation between the two.