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Your X & Y belts are not tight enough. The tend to come loose from the factory - I Had the same issue. The slack causes circles to be elongated. Simply tighten the belts and you will have perfect circles in just a few seconds of adjustment. Y is the belt on the heat bed, X is the belt on the Hotend. You'll find a detailed explanation on the reddit tread below.

https://www.reddit.com/r/3Dprinting/comments/7yfwvk/belt_tension_newbie_question/