Why is my website contain ":>°^" instead of ":>°^"?

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Python

Hello, coding and Scratching guys,

as you saw, my website returns:

///////////////////////////////////
// CODED BY RIX                  //
// DO NOT EDIT YOURSELF          //
// TO ADD SOMEONE, WRITE TO CHAT //
///////////////////////////////////

class Scratchables {
	getInfo() {
		return {
			color1: "#f9a83a",
			color2: "#c7862e",
			id: "Scratchables",
			name: "Scratchables!",
			description: "A collab between Scratchers 'n' Replers made by Rix",
			blocks: [
				{
					opcode: "rix",
					blockType: Scratch.BlockType.REPORTER,
					text: ":>°^",
					arguments: {}
				}
			]
		}
	}
	rix(args) {
		return "\n"
	}
}

Scratch.extensions.register(new Scratchables())

Notice that ":>°^", that it's not ":>°^"? Because, in the script, it is ":>°^"... Oh, and, um, here's my code:

########################
# CODED BY RIX         #
# DO NOT EDIT YOURSELF #
########################

from flask import Flask, make_response, send_from_directory
app = Flask("app")

@app.route("/")
def main():
	resp = make_response(open("source.js", "r", encoding="utf-8").read().replace("Â", ""))
	print(resp.headers)
	resp.headers["content-type"] = resp.headers["accept"] = "text/javascript"
	resp.headers["content-type"] += "; charset=utf8"
	print(resp.headers)
	return resp

@app.route("/<path:file>")
def source(file):
	return send_from_directory(".", "source.js")

app.run(host="0.0.0.0", port=8080)

What I have tried: