you have the wrong blades on. There should be 2 blades with a hole in the centre and 2 without the hole... This means the blades are working against each other. I has the same. As a last resort I read the instructions... they were very hard to find... you have to follow the link in the paper instructions (not particularly useful)
-place the propellers with a hole in the middle on the motors with a protruding axle
(front right and rear left motors);
-place the propellers without a hole on the motors without protruding axle (front
left and rear right motors).
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