Thanks for sharing this with us in the Community, scanjo17.
I can't see any other reported cases at the moment. Let me share these steps to verify if this is a browser-related issue and resolve it as well. Here's how:
Use an incognito/private browsing session and log back in to your account.
Open your invoices again to check if the cross is still showing up. If its no longer there, switch back to the original browser or regular browsing session.