[Vue/Typescript] Memory leak when changing a value that indicates an index in a computed property

Hi,

I am having issues with a computed property

correctAnswersForCurrentStage(): object {return 
    return this.correctAnswers[this.currentLevel] ?? {};
},

Some context:
this.correctAnswers is an object where the properties are the levels and the values are object for each gate:

this.correctAnswers = {
     "1": {
        "1": 15,
        "2": 25,
        "3": 35,
        "4": 45
    },
    "2": {
        "1": 15,
        "2": 25,
        "3": 35,
        "4": 45
    },
}

so when a level is finished, i increase the level like

this.currentLevel++

and after this everything blocks. I don't know if it's Vue or TypeScript that gives this problem. Or maybe the combination of both?
Anyone an idea why this happens?