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The elevation slider can get a little weird if you are trying to set it to things that it shouldn't be set to. Based on your aircraft's maximum camera framing speed, the overlap setting, max speed setting and altitude, the app will attempt to keep you from making altitude settings that are invalid based on the other numbers.
Try this: Choose 50/50 for your overlap and make sure your max speed is set as high as it can go. Given that you should be able to up and down quite a bit on the altitude slider.