Are you sure you are not over filling the device? Sometimes if it's too full it will boil over the top of the lid. Try using a little less water next time.
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If that doesn't help, you might have faulty water tubes within the coffee maker. You should replace the tubes.
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If that doesn't help, you might have faulty water tubes within the coffee maker. You should replace the tubes using the following replacement guide.
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[https://www.ifixit.com/Guide/Rival+CM4015+Water+Tubes+Replacement/72372|Rival CM 4015 Water Tubes Replacement]
Are you sure you are not over filling the device? Sometimes if it's too full it will boil over the top of the lid. Try using a little less water next time.
If that doesn't help, you might have faulty water tubes within the coffee maker. You should replace the tubes.