Strange giant thing appearing

So I’m making my game but I notice that sometimes when I click play or run this giant shape appears in the sky. I don’t know what it is here is a picture of it:

When you click Play does anything appear in the Explorer window?
From the looks of whatever is in the bottom right of your screenshot it looks like you have Fog or some other Lighting element active that greys out anything over a certain distance away.

Have you used any Free Models or Plugins recently from the Toolbox?

This is a game me and my friends built but in the lighting instance there is no fog property. The fog only appears when the giant shape appears. And me and my friends are making the game. I don’t use free models and i only use trusted plugins. They even asked why there was that giant cloud

Are you able to see it in the explorer though?

After I removed the skybox it stopped randomly appearing… strange. it didn’t have any scripts in it.

never mind it appeared again. I dont know what it is

no theres not fog preperty when it happens

When you are testing the game and it appears, look in your Explorer window (NOT when the game isn’t running) and check in all the folders in the Explorer window. If you find the object or the fog settings change, or the Atmospheric Effects | Roblox Creator Documentation settings change then something has inserted a script into your game somewhere that is changing these items.

This kind of weird behavior seems to happen in a lot of cases where many people are working on a game. It’s usually because somebody has used a free model or a plugin that may be popular, but might not be from the original creator of the plugin and has a hazardous script in it.

Strange. I checked even while playing the game. I even deleted all my stuff in lighting but it still happens and my anti-virus and game defenders don’t detect any threat

The issue is that the script is probably not in your Lighting folder, it’s probably injected somewhere in a different folder or item.
Are you sure your anti-virus is an anti-virus from a trusted source, or is a copied version that’s injecting this into your game?

the only anti virus I use is the one that devs on the DevForum recommend to remove viruses and backdoors