To expand on what DJ is saying, the monitor profile LR is trying to use is incompatible with LR so the colors are shown wrong. The telltale sign is that the gray area in the histogram has a light tint while the user-interface is still neutral. Wherever LR uses color-management there'll be a tint (photo, histogram) and wherever it doesn't (the UI) there isn't a tint.
The usual issue is that your monitor profile is set to one that comes from the monitor manufacturer and typically has the monitor name or model number as part of it. Besides looking for tints in particular places in LR, the other way to check if this is the problem is to set your monitor profile to sRGB-xxxxxx as described, here:
How do I change my monitor profile to check whether it’s corrupted?