I have had success with magnetic stickers by making sure that the magnet was NOT completely surrounding the sticker so there gaps that would allow air to circulate under the sticker. Also I have put some thin tape over the magnet surface that contacts the car. The magnet still sticks however there is little or not marks left in the paint. Try NOT to have a solid magnet under the sticker covering the complete underside of the sticker. This really attracks the sun/heat and causes the problem you experienced.
You will not be able to drive down the road with the magnets attached this way as they will fly off much easier however it will help to prevent the paint issues you have experienced.
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