It’s a Operating System thing (that will affect browsers) Ctrl + mouse wheel scrolling will zoom in and zoom out and not something Zazzle can control I think
This happens to me occasionally, pretty frequently, but yeah its the browser/computer and not zazzle. I use MACs but if you browser ever zooms far away or too close, you can sometimes click in the address bar and there may be a percentage to the right of the URL and you can click that to bring it back to 100% the other option would be to click “view” in the menu bar and scroll down to zoom and choose “actual size” or command + 0 on mac. I recently disabled one of the mouse controls on my magic mouse that was causing this to happen a lot, and happen in Adobe too, lmao. very frustrating. But its gotten better now.