FIXED!!! It was an add-on that updated and was no longer compatible that was causing the trouble. The add-on called VenMate Free VPN was the culprit. My friend found it by disabling one add-on at a time until Windy worked right. She said that the reason it says "Download App" is because it is Windows 10 and not because it thinks the size of the screen makes it think it's a mobile device.
Thank you for everyone who was trying to help me.
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