Lines at image edges at certain zoom levels

[shm-swe]

I have a problem with lines that are visible at the edges of certain images but only at some zoom levels and in parts of the image. The lines are not in the image itself.

[shm-swe]

Live example here: Lines on the left image at cetain zoom levels. https://vikingar.historiska.se/object_details.php?object=1BF1AD87-BADE-4700-8ACA-14225330F7B3&e=no&l=en

[iangilman]

It's definitely in the tile images. For example: https://static.historiska.se/iiif?IIIF=KMK_DIG56213.iiif.tif/0,4096,2048,575/256,/0/default.jpg

It's not in every tile at every level; you can see it coming and going as you zoom in and out. That implies it's a flaw that is being introduced by your tiling process somehow.