Footstep sounds retriggering (sound cuting midway through)

[cameron-fmod]

It sounds like you want to use asynchronous instruments, this will allow the entire sound to play out rather than cutting out.

https://fmod.com/resources/documentation-studio?page=working-with-instruments.html#synchronous-and-asynchronous-instruments

Either that or create a new instance for each footstep sound you want to play.