Is the image a screenshot of a layout ?
If so it's certainly that the views the drawings are generate from are not at the same scale.
I think so because the cotation text and the story level markers are also smaller in section 3 than in section 4 with the same scale difference.
The scale of a drawing place on a layout can be different from the source view.
For example a drawing scale can be 1/100 and the source 1/50 ending as the equivalent as a photo copy reduction of 1/2.
Check the to drawings options and compare the drawing and source scale for each.
ArchiCad 3.43 to 26