bremen It probably something small like mine was once i got it working
You can take a look at my full config here, ive added comments to most areas i feel are helpful.
Not sure if it works without it, but I have my global number HighScore and Score, as well as the local key HighScore, the exact same, as they are case sensitive.
you have both Highscore and highscore...so might be some cross there
Only other thing i can see from that image is you have it ***
Set highscore int(Webstorage.localvalue...etc
Not sure if it works with the int? mine is just "Set HighScore WebStorage...