Xperia Active :: Contrast Getting Worse When Scrolling?

I believe this also happens on similar 2011 family phones, probably all sharing the same display/screen size, but in a manner way worse: everywhere content is scrolled. I've seen this in the stock browser, in Instagram and similar apps.What happens is that if there is an image on the screen and you change the view by scrolling, the contrast of the image detoriates heavily.E.g. in Instagram, theres the image the user has uploaded and on top of the screen is the avatar of this user. If you start scrolling the screen content, the contrast of the screen changes as long as the avatar is not completely on screen. Like as long as the first pixel row of the content is completely white, the contrast is 0 and if the first pixel row is broken into dark and bright pixels, the contrast changes to -10.This is very annoying as theses are very heavy contrast changes, like complete loss of cloud texture (as taken with a very low spec phone).My active is on ICS, 4.1.B.0.431 but this issue has happened since GB 2.3.4.