Hi there!
I will need more information. Like your plugin parameters to see what variable id you put on the distance variable and also, an event setting the variable a value.
You also need to keep in mind that your character needs to be on a tile that allows him to jump and land. You need to understand the Jump Rules on the plugin parameters. If, even so, it did not work, can be a compatibility problem.
So better to test on the sample project to check if this is a issue. If it works on the sample project, then send me a sample project replicating the issue so I can take a look;