Pink circles and glares with sunset photos

I just recently purchased the Canon sd750. So far I love the camera, however whenever I take photos of a sunset I have large orange and pink circles in the middle of the photo, as well as random pink blobs of glare elsewhere in parts of the pictures. I've tried changing some of the automatic settings but nothing seems to change. Is this typical of this model or is it a defect?? Are there any other changes in settings that I can make? I recently owned the sd630 and my sunset shots were perfect. (No glare whatsoever.) Any help would be much appreciated! Thank you! :-)