I've run into this odd quirk with a texture i loaded, to demonstrate it i have replaced the texture with one a bit more simple. when i view the textures in an editor they look fine, however loading them into jpct causes the a chunk of the left side to be cut of and moved to the right side.
Here is the texture
Here it is being rendered.
If you are wondering about the fuzziness it's because i haven't got shaders set up entirely correctly yet.