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GPU acceleration has been introduced with LR6.
Try to reset the color Profile of your Monitor to sRGB - for testing purpose only, since you should calibrate your monitor.
Thanks for your reply. I have checked the monitor. When i import the photos and they are in library they are fine. Its when i click the develop tab the photo changes
That is exactly why I told you to reset the color profile. Try it, and then post back.
I have tried but still have the same problem
There are multiple reasons why: bad monitor profile that causes Develop to render wrong usually with a color cast, bad GPU driver (turn off the GPU in Prefs / Performance) that probably causes Develop to render wrong, corrupted preview cache so the previews don't get updated, so Library is wrong, etc.
Could you post a screenshot of your Develop module with the problem showing? Also, include the histogram in the shot.