Hi Djaydino!
After you mentioned that, i went in and tried to isolate my issue further; i stripped away everything i had on my player object, and although i thought there couldn't be anything wrong with my FSM, i actually had TWO instances of the mouse look action, one for the X axis and one for the Y (this was done intentionally, to move the player and camera independently)
Once consolidating them both into one action, the jumping thankfully stopped;
Unfortunately, the effect i got isn't exactly what i was looking for; it seems like i need a more "local" solution than a "world" solution, because this is what happens when i try to move the camera left to right:
https://giant.gfycat.com/WarpedIllegalFlatcoatretriever.webmI guess i'll have to research a new way to do this, considering the 'mouse look' action doesn't seem to have a way to approach this! Thanks very much for the help!