Weird Script Code

Hello. I’m having some weird issue.
Every time I start up a studio file. There’s always one line of code in the ServerScriptService that has a line pasted in front of the first function in the script. I don’t know what it is or why it just keeps doing that.
Can someone explain?

this is a backdoor please delete this script!

How is it even getting there?

Have you inserted a free model in recently in that game. If so that could be causing it.

Only thing I inserted was some mesh parts to build with.

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