A model number may help others help you.

Check that the holes in the spray arm are all clear.
Sometimes a partially clogged spray hole will shoot the water out at a weird angle and cause a leak.

Check to ensure that the leak is actually at the seal. Sometimes the float assembly (usually on the left hand side in the tub) can get crud in it and the water is sucked up to cause a leak.

If it is a unit with a filter mat on the bottom make sure it is laying flat, again if it is raise somewhat it can direct the water at a weird angle.

Some units have a piece that goes between the two ends of the door seal where they meet at the bottom of the door, check that it is there.

Some units have rubber seals in the corners of the tub, check that they are OK.