For some reason my animation looks good in spine, but when I export it to json and run it in pixi runtime, I get a visible line between pieces.
Here is what the 2 pieces joined together look like in spine:

This is what it looks like in pixi:

And this is what one of the parts looks like in the PNG.

There is indeed a grey line at the top of that piece. But why does that not show up in spine? Is there a problem with the way I'm exporting or with my runtime settings? Thanks!