Spawn makes actor move around if scale is not (1,1,1)

I am spawning a cylinder blueprint into the level. (Shape Cylinder from Starter Content). All fine when scale transform is (1,1,1), but the moment I change the scale, either in transform or in the spawned BP itself, some force is starting to act on the spawned cylinder, trying to erect it. Result is like a metronom movement of my spawned cylinder. This does not happpen with scale (1,1,1). Is this a bug?

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