Importing strip has different position for each row

I'm trying to import this image as a sprite strip to create an animation, using the settings below. However, C3 sets a different centerpoint on each row, so every 8 frames the animation jumps a bit. I'm guessing it's because the images don't have defined edges, but any suggestions on how to import it more consistently without having to define different origins for every 8 frames?

what do you mean, define origin, isn't the origin the center ?

if origin is the center of the image, and the image isn't in the center, the problem is most likely in your art or export program