The best bet is to remove the inner panel or refer to the service manual parts drawings for reference. Many window motors/regulators employ a trip switch to deactivate power when either up or down limits are reached. If this is the case, the contact switch is usually mounted to the assembly and can come loose throwing off the travel.

Some regulators employ a clutch switch which is tripped via physical resistance, ie. meeting physical stops; in this case, the most common issue is what you have due to loose mounting of the regulator or window arm assembly to the body of the car.

You will need to remove the panel and actuate the window up and down until you see the issue. 9/10 times your whole assembly is loose in it mountings and needs to be tightened with maybe a little thread lock.

Good luck

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Stable Mates:
1987 300TD 310K mi (Hans)
2008 Jeep Grand Cherokee OM642 165k mi (Benzrokee)