To see if this is the case on your G300, without having to install any extra apps, do the following:
Run the stock Calculator app (in the Tools folder by default) and turn the screen to landscape, with the Huawei logo on the left. If you have the screen misalignment problem you'll notice that the curved corners on the left-hand edges of the left-most buttons are cut off, but the curved corners are fine on the right-most buttons. If you rotate it to the other landscape orientation, so that the Huawei logo is on the right, you'll see the same except cutting off the curved corners on the right-hand edges.
Edit: added pictures, click to enlarge:
This is a screenshot taken from within the device itself, where you'll see that button corners are supposed to be round on both left and right. You'll also notice that the buttons are right up to the very edges of the screen, which is why the Calculator app is a good test for this (most apps don't draw right up to the edges):
screen_20120627_2004.png 103.76K 96 downloads
Photo of how Calculator really looks in device in landscape with Huawei logo to left:
20120627_002.jpg 95.86K 108 downloads
Photo of how Calculator really looks in device in landscape with Huawei logo to right:
20120627_004.jpg 56.48K 80 downloads
Not pictured, so you'll have to take my word for it, are how things appear at the other end of the screen, by the capacitive buttons. There the Calculator buttons do show their rounded corners, so the problem is just at the top end of the screen, by the Huawei logo.
Edited by pelago, 27 June 2012 - 07:25 PM.