Humidity way too high. 70 percent is a myth. Most here prefer low 60s. I personally like high 50s. Where the sticks bought online? If so, many E-tailers over humidify their sticks to protect them in shipment. They need to rest for a couple weeks to a month just to dry out. Heck, I've had some sticks that had to rest 6 months or more before they smoked and drew correctly.
You also may not be lighting them evenly. An uneven light can sometimes cause canoeing.
Is the burning core off center? Sometimes the ligero in the center is rolled off center, which will also cause canoeing.