I am using Inkscape 1.4 (86a8ad7, 2024-10-11) on Windows 11.

I have an A4 page of 6 "This Way Up" labels that I've created. Each label is made up of two up arrows, a thick horizontal red line and the text THIS WAY UP grouped together. The 6 labels are not grouped together but separate on the page.

I select one of the labels (I want crop marks around each label so just trying to get one to work first of all) then select Extension -> Document -> Layout -> Printing Marks.

I ensure Crop Marks are selected in the Marks tab and in the Positioning tab I choose "Set crop marks to: Selection" and have 5mm set for Offset and Bleed Margins.

The lower right crop mark (1) is perfect vertically but horizontally it's flush with the right hand edge of the selection rather than being offset 5mm, so it's not where I want it.

The lower left crop mark (2) appears about one label width further left than it should be. The top crop marks (3) and (4) are waaaay up the page above the label, about four label heights higher than they should be.

Am I doing something wrong? Is it a bug?