Yes very possibly issue. If you have the height and width set to px (and no dimensions is px), then Fritzing will guess at the dpi (and old Illustrator used 72dpi). The cure is to set height/ width in in or mm so the dpi and scale are specified and Fritzing won’t have to guess. You can also upload the problem sketch / svg (for the svg you may need to rename it to fzpz as the forum sometimes has problems with svgs) using the 7th icon from the left in the tool bar and one of us will have a look at it.
Peter