Don’t be concerned as it’s quite normal, you just notice it more when the derailleur isn’t there to take up the slight variations in tension. It occurs mainly due to very slight eccentricity in chainrings/sprocket. This isn’t an indication of poor quality.
Find the tight spot and set the chain tension so you don’t feel it binding when you rotate the crank (you want a small amount of slack in the chain at the tight spot, but not too much), then you’ll be good to go.