Why Bootstrap modal deletes my click events

I use a Bootstrap modal to create a popup and when it closes, all the click events of my documents are deleted, included the one I have just clicked.
Could you help me, please?

To activate the modal, I click on a button with the id “btnAddPortfolio”.

function initBtnPortfolioMainContentAddPortfolio(){
    let btnAddPortfolio = document.getElementById("btnAddPortfolio");
    btnAddPortfolio.addEventListener("click", () => {
        displayPopUpLoadFileCreatePortfolio();
     });
}

function displayPopUpLoadFileCreatePortfolio(){
    let root = document.getElementById("root");
    let html = [];
    
    if (document.getElementById("PopUpLoadFileCreatePortfolio") === null){
        html.push('<div id="PopUpLoadFileCreatePortfolio" class="modal" tabindex="-1">',
                    '<div class="modal-dialog modal-dialog-centered">',
                      '<div class="modal-content">', 
                        '<div class="modal-header bg-info">', 
                          '<h5 class="modal-title">Créer un nouveau portefeuille</h5>', 
                          '<button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>', 
                        '</div>', 
                        '<div class="modal-body">', 
                          '<div class="mb-3">', 
                            '<label for="formFile" class="form-label">Sélectionner le fichier à importer:</label>', 
                            '<input class="form-control" type="file" id="formFile">', 
                          '</div>', 
                        '</div>', 
                        '<div class="modal-footer">', 
                          '<button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Annuler</button>', 
                          '<button type="button" class="btn btn-primary">Valider</button>', 
                        '</div>', 
                      '</div>', 
                    '</div>', 
                  '</div>', 
        );
        strHTML = html.join('n');
        root.innerHTML += strHTML;
    }
    let PopUp = new bootstrap.Modal(document.getElementById('PopUpLoadFileCreatePortfolio'), {
      keyboard: false
    });
    PopUp.show();
}