Please show us your event. We can tell absolutely nothing from the video.
If you have plugins, also include a screenshot of your plugin manager.
Just out of curiosity, does it still happen when all plugins except for Cyclone Movement are disabled?Wait I just found out what's causing it, it seems to be a bug in the Cyclone-Movement plugin it only happens when its active and at the top left corner of the map when you hit the action button though, its not really that big of a deal though since the top corners of maps are normally filled in with something anyway, I was just very confused by this sorry.
yup even with all plugins disabled, its just a weird bug in the plugin, I wonder why though...Just out of curiosity, does it still happen when all plugins except for Cyclone Movement are disabled?