Two UILabels rendered differently in retina and non retina iPhone displays

I have designed an interface in a NIB which has two UILabels. The labels are in close proximity to highlight one particular word in a different colour.

The issue is that on a non retina display the two labels render as desired. See Image 1:

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However on a retina display the label for the white text overlaps some of the blue text. See Image 2:

enter image description here

Note that the frame of the white text label doesn't seem to have moved rather the issue seems to be the word wrap on the blue text label.

Has anyone seen this before and figured out a quick/ painless cure?

Solution

Posting as an answer as requested:

This looks like a possible bug or edge case with the larger label's size. If you widen it by a single point, it may wrap correctly on both devices. It may be worth reporting this as a bug, since the objects should behave identically on retina and non-retina devices.

This will be a non-issue for you in iOS 6, anyway :)