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There should be a pan under the machine that collects water when the machine goes into defrost. It often is dry because the motor causes it to evaporate quickly.
Water inside is usually caused by the drain hose to the pan underneath becoming clogged. It can ice up or be clogged with debris.
Let me know if you need any more information.
The drain hose will start behind the back wall inside the freezer and go down to the drain pan (part number 26 below) -
You can start with a turkey baster filled with hot water from the top and see if it drains all the way to the bottom pan. If it doesn't you wait a minute and pull back the water and replace it with more hot water. You keep doing this until you have the drain hose clear and water flows to the pan all the way. In some cases you may have to find a small plastic tube to push thru (if there is debris there).