Machine seems to fill with water when not in use

This often is a drain hose that is too low or a drain hose that has been pushed too far down inside the stand pipe....the water is actually siphoning out of the washer. Do not "seal" the drain hose to the house plumbing pipe, this will also allow the water to be siphoned out.If drain hose is checked ok then its confirmed problem of faulty water fill valve.
the fill valve is leaking. When they go bad they can leak water without being told to by the timer. I would replace the fill valve after pulling the hose off the fill end and watching to see if water drips out.

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