Transition is inverted

[maxwbregler]

I set up the CLI version via "npm install -g ffmpeg-concat" and when I do a transition, the transition part is inverted. EX: when I do "ffmpeg-concat -t heart -d 1000 -o test.mp4 vid-1.mp4 vid-2.mp4", the heart is upside down. I have noticed this with other transitions; the videos themselves are fine, but whatever visuals are being used to transition between them are always inverted. There don't seem to be arguments for direction in the CLI version, so I'm pretty confident that it is an issue with the software.
Thank you for reading