The order of a gallery is dependent upon the naming of the files.
If the filenames do not have padding zeros, the order of images will appear as follows:
1.jpg
10.jpg
100.jpg
101.jpg
...
11.jpg
110.jpg
111.jpg
etc.
With padding zeros in the filenames, the order would be:
001.jpg
002.jpg
...
010.jpg
011.jpg
...
100.jpg
101.jpg
etc.
There are some utilities available for download which will allow you to easily rename a batch of files. Just Google, "batch rename" or "rename files".
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