they are NGK plugs. even VW's use NGK as oem plugs

Not bosch??? crazy

what is the plug part number for the iridium IX? i looked on the NGK site and had to go back to the 2005 2.0l engine to find a part number for the IX's. is this the right number and will it fit my 2008 3i ??

Part #: TR6IX
gap: 0.52
stock number 3689

You should't have had any issues, but since you did, try removing the battery for a minute or two and re-attaching it. Sometimes a module can get a bad reset signal as the battery terminals are arcing when making a connection. I've seen this happen with low voltage / dead battery issues too.

New plugs won't cause an issue unless you actually got the wrong ones... completely possible since the car is a 'new entry' for anyone's parts database. When looking at the plug, the length of the washer to the tip should be the same - and the length of the insulator that's holding up the tip should be the same length. Different manufacturers / materials can change this a bit, but the insulator length controls how much heat stays in the tip, too much or not enough can cause problems.

The only magnetic thing i'm aware of is a hall pulse sensor - one's used for the crank angle that's on the passenger side of the car (you can see the steel wheel with a bunch of teeth on it). Other than that there should be no magnetic sensor to get all screwed up.