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@xmilosx
is your chain lined up correctly?
i had the same problem with the chain coming off so i put the chainring on the inside of the crank arm, so the tabs on the crank arm are on the outside, and it sorted that right out! maybe give that a go.
just check everything is done up tight and and make sure the wheel is lined up correctly. it maybe ok when you apply little force to it, like spinning the cranks with your hand but when you apply a much greater force, like when you pedal with your legs, the frame/crank arms/wheel will bend a little. so if its out of line theres more chance of something rubbing. chain tensioners maybe?