When trying to make a cube, no cards pop up after typing a Pokemon name, for example, into the search bar provided, so building it is impossible. Sometimes it will show me the number of cards that would have been there, but not always, and anyways the cards won't appear to click on. Sometimes, when pressing "enter" to make it search, it just causes the page to refresh. I've tried on 2 different computers on different days, one on Windows 10 on Edge and the other on Windows 11 in Chrome, so I don't think it's a computer/browser issue, but I'm also not very techy.
