Using the Script Analysis tool, I have found two strange and suspicious scripts in InsertService. They were called ?, and InsertionHash. I have not checked InsertionHash, but ? contained many (9, to be specific) references to Synapse Xen. Should I be concerned? I have already deleted these scripts.
Your best bet is to uninstall the Roblox studio and delete all the plugins. It is probably a virus on your plugin. Make sure to read the comments and never use plugins there have less than 100 likes or less than 80 ratio likes and dislikes.
If that did not work, reset the roblox studio settings i guess