If the door was closing too quickly move the spring to the next higher hole on the bracket.
One side of garage door higher than other side.
When this happens you need to shift it back into position.
This can happen when the door has shifted to one side causing it to appear uneven.
In the next series of steps you will move your ladder to the other side and climb up to the left cable drum.
Garage door crooked and the cable came off.
Some times you need to adjust the garage door.
Adjust the springs on both sides of the door the same way.
If it was opening too quickly move it to the next lower hole.
The mark on the shaft should be about 1 4 above the mark on the drum as shown.
There are several things that can cause this.
If the gap under the door is less than one inch make the marks 1 8 apart.
Retest the door balance as you did in step 1.
The most simple and common is door shift.
Vise grip the shaft.
Using a marker or file mark the shaft and the drum.