I would double check the fitting. I fitted new H7 bulbs to my Leon yesterday morning and got exactly the same
problem which I noticed while I was out driving last night. It turns out I'd fitted them upside down, once I'd changed them they were a million times better.
If you image the base of the bulb, the flat bit that has the small bit poking out should be pointing upwards, when I fitted the bulbs originally I had this pointing downwards. I would image the fitting would be the same in the
Ibiza.
And I've learn't an important lesson. Look at the way the old bulbs fitted before you take them out!