Screwed up my code, local storage worked, now it doesnt again, no idea what changed

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Javascript

HTML5

I was trying to set local storage of best game times, so I created an empty array `gBestScores` and compared the value of the last best score to the current one,
and depending on the result I either push it or not to the array.

The local storage supposed to save it. The saving doesn't happen and the array stays empty. The `currScore` is showing the correct clock content.
`lastBestScore` is undefined. Iv'e tried hard coding 2 start times to the -1 won't come back as unidentified, that didn't work, and it work beforehand without doing that

the comparison and the storage worked, i have no idea what i changed, ctrl-Z failed to save me,
hope you can.

edit: i did another check, the array is being ovewritten to 0 when the functions in the init occour, even with hardcoded values, no idea why

`var gBestScores =[]`

in the init i have:

var retrievedData = localStorage.getItem("scores");
        gBestScores = JSON.parse(retrievedData);
        bestScore.innerHTML = gBestScores[gBestScores.length - 1]

the rest of it:

function checkGameStatus() {
        // debugger
        var currScore = result.innerHTML
        var lastBestScore = gBestScores[gBestScores.length-1]
        if ((gLevel.SIZE ** 2 - gLevel.MINES) === gGame.shownCount && gLevel.MINES === gGame.markedCount) {
            gElBtn.innerHTML = WIN
            gGame.isOn = true
            stopwatch.stop()
            if (currScore > lastBestScore) {
                gBestScores.push(currScore)
            }
        }
        else if (gGame.isOn === true) {
            gElBtn.innerHTML = SAD
            stopwatch.stop()
            if (currScore > lastBestScore) {
                gBestScores.push(currScore) 
            }
        }
        localStorage.setItem("scores", JSON.stringify(gBestScores));
        bestScore.innerHTML = lastBestScore
    }

What I have tried:

tried debuggeing, it does come back as null, no idea how to fix tho since it worked before