Might come from the original file or might be a bug with Gimp 2.10.34 Using ImageMagick there is a 2 pix offset, apparently in the page geometry (whatever that is) lots of TIFF warnings. Post the original for Ofnuts.
Using Gimp 2.10.38 (kubuntu 20.04) Image -> Crop to content to get rid if the 2 pix left side transparent margin and Export with your settings. That fixes the offset here, still have the tag warnings. Strangely the file size is slightly larger 25926520 <> 25926750.
Try updating your version of Gimp.
Quote:N042E012_AVE_DSM.tif TIFF 3600x3600 3600x3600+2+0 16-bit Grayscale Gray 24.7255MiB 0.010u 0:00.020N042E012_AVE_DSM.tif TIFF 3600x3600 3600x3600+2+0 16-bit Grayscale Gray 24.7255MiB 0.000u 0:00.019
identify: Unknown field with tag 33550 (0x830e) encountered. `TIFFReadDirectory' @ warning/tiff.c/TIFFWarnings/958.
------repeated 9 times-------
.......................
Filename: N042E012_AVE_DSM.tif
Permissions: rw-rw-r--
Format: TIFF (Tagged Image File Format)
Mime type: image/tiff
Class: DirectClass
Geometry: 3600x3600+0+0
Resolution: 72x72
..........snip.........
Compose: Over
Page geometry: 3600x3600+2+0
Origin geometry: +2+0
........................
icc:manufacturer: GIMP
icc:model: D65 Grayscale with sRGB TRC
........................
tiff software: GIMP 2.10.34
tiff timestamp: 2024:06:11 21:29:58
Using Gimp 2.10.38 (kubuntu 20.04) Image -> Crop to content to get rid if the 2 pix left side transparent margin and Export with your settings. That fixes the offset here, still have the tag warnings. Strangely the file size is slightly larger 25926520 <> 25926750.
Try updating your version of Gimp.