I have a 2006 Ford Mustang V6 4.0L. I just purchased these Bosch 6715 platinum spark plugs and installed them. I took them out because I noticed air was coming out of the spark plug socket. When I inspected them when they were out these plugs were bent. What could be the issue? I'm going to buy standard Motorcraft copper plugs to replace these $3.00 plugs.
I think the only reason that would happen is that the plugs are just a little too long for your head and they have been impacted by the piston. Compare these to other models for your car and check the length. Since it's only bent a little, I doubt any serious damage was done, but certainly double check that you get the right parts before installing new plugs.
I also just noticed that there is no washer on the top of that plug. I'm use to seeing a washer there, and a missing washer could make the plug sit too low. So, that's another possibility.
The plugs have a tapered seat so don't need a sealing washer, but the length overall from the seat to the electrode is critical. You need to check against the ones you removed - if, of course, you still have them.
The other concern is the apparent damage to the threads or have you applied some sort of sealant / lubricant...