If I place circle silkscreen on board or on footprint, the circle silkscreen will be exaggerated a lot in Gerber after plotting. Software version is V5.1.2. Didn’t see this phenomena in previous versions.
The circles silkscreen in Gerber which were exaggerated a lot. The other silkscreen texts and arcs are normal.
Please file a bug report about this here: https://bugs.launchpad.net/kicad, and it would be good to include the example project in your report along with the generated files.
An update to this. I found the circle silkscreen was normal when I used Gerber Viewer to review the Gerber data. If the data is opened by CAM350, the circle shapes on silkscreen will be exaggerated a lot. And all the circle shapes have the same position x:0 y:0 with different radiuses.