yes, one or more of the plugins are the cause of this, and now you need to find out which one and why.
one thing is obvious: your yanfly plugins are in the wrong order.
please reorder them into exactly the order given on yanfly's website, then test again.
If the reordering and starting a new playtest is not enough to solve the problem, you'll need to disable one plugin after another to find the culprit, always starting a new playtest game after each change in the plugin manager.