I think / lay command is seen in us. / sit, you can see that you are sitting in a carat, but when we write / lay, we can not see our character lying there like this.
Moved to report bugs The plugin is not made by J&H themselves. In other words, it's a 3rd party plugin. If you want this fixed, it should be reported to the plugin creator.
Are you playing on Minecraft pre-1.9? I'm pretty sure it's a client bug if you're playing 1.8.9 and lower.