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gdal2tiles only rendering half of tif

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I am using gdal2tiles.py to render map tiles of some data.

The file I use is generated by combining a .tif and .tfw using gdal_translate XX.tif XXn.tif

Whenever I open up the file in QGIS, I see all the data:
Original data in QGIS

Next, I create tiles by gdal2tiles.py -p geodetic --s_srs "+proj=longlat +datum=WGS84 +no_defs" --srcnodata=0 final.tif and add it to my website, but half of this file is rendered. (I’ve already adjusted Leaflet to use TMS indexing.)
Rendered tiles over base layer in browser

gdalinfo dump:

Driver: GTiff/GeoTIFF
Files: XXn.tif
Size is 3600, 1800
Coordinate System is `'
Metadata:
TIFFTAG_DATETIME=2015:05:01 21:05:52
TIFFTAG_DOCUMENTNAME=XX.tif
TIFFTAG_IMAGEDESCRIPTION=IDL TIFF file
TIFFTAG_RESOLUTIONUNIT=2 (pixels/inch)
TIFFTAG_SOFTWARE=IDL 8.3, Exelis Visual Information Solutions, Inc.
TIFFTAG_XRESOLUTION=100
TIFFTAG_YRESOLUTION=100
Image Structure Metadata:
INTERLEAVE=BAND
Corner Coordinates:
Upper Left ( 0.0, 0.0)
Lower Left ( 0.0, 1800.0)
Upper Right ( 3600.0, 0.0)
Lower Right ( 3600.0, 1800.0)
Center ( 1800.0, 900.0)

Any ideas? Is this a projection issue? I haven’t worked with tif files before so I may be wrongly invoking one of these commands. I’ve also tried using gdalwarp on the file and rendering it with the above command for gdal2tiles and I still get the same issue.


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