Add raster to mosaic dataset doesn't display correct values but no error

[SidonieHorn]

I am trying to create a mosaic dataset using clipped Hansen tree cover data. I have a script that extracts each raster to my desired extent. However, I want to make all my separate rasters into one raster. The individual raster look correct (values 0-19) and AddRastersToMosaicDataset runs without giving me any errors. However, my output appears to be empty and displays the values 0-255. I'm not sure how to fix this and would appreciate any tips.

Here is the last chunk of code. 

# Add rasters to Mosiaic dataset:

fgd_dir = in_raster_folder
fgd_name = "test_data.gdb"
fgd_path = os.path.join(fgd_dir, fgd_name)

fgd_ds = os.path.join(fgd_path, "mosaicds")

arcpy.AddRastersToMosaicDataset_management(
in_mosaic_dataset = fgd_ds,
raster_type = "Raster Dataset",
input_path = out_raster_folder,
sub_folder = "NO_SUBFOLDERS",
duplicate_items_action = "OVERWRITE_DUPLICATES"
)

[DavidPike]

I would throw in a Calculate Statistics.

[SidonieHorn]

That didn't seem to make a difference. 

[DavidPike]

What do the Min and Max PS sizes look like?  What file types are in the Raster folder, and is there possibly a mixture of filetypes?

If you export Mosaic Dataset Paths do they look correct? And possibly try the operation manually on a subset of data to test.

[KeXu]

I met with the similar problem. Use GP tool Calculate Statistics on MDS, then get the right result. As you said, that didn't seem to make difference. Please try to set Strech type to Percent Clip.

[aallegretti]

Build Pyramids and Statistics on the MDS