The curved or wrinkled edge on almost all paper is normally caused by humidity. The higher the humidity, the more likely a paper stock is to curl. This is due to a rapid, but uneven, drying of the paper stock as it is passed through the heated fuser assembly in the LaserWriter.
This condition can be lessened by storing the paper stock and printing in a dryer, humidity-controlled environment. You may need to use a dehumidifier to lower the relative humidity in the room where the printer is located to lessen the amount of curl. However, an environment that is too dry may cause the toner to scatter on the page before it is fused. This can cause grey areas that look like dust.