PC Grow Bulbs blowing out...WHY?

So i have a PC grow box with a powerstrip and 4 cfl bulb locations pluged in. They are 26w cfls, The power is running from the wall; through an extention cord that the powerstrip is pluged into.

I fired up my pc grow box and almost right away a bulb died... So I unplugged all other appliances and put a new bulb in and a few minutes later a different bulb died.

Then I figured maybe it cant handle having 4 so i just ran 3 bulbs and left it on to see how it would go... a few minutes went by and one of the 3 remaining bulbs burned out...

Im obviously no electrician but what can i do to fix this. I see many pc boxes running 4 26w bulbs at one time... What do you think it is?

Note: I am in australia so i am using a plug adapter but that shouldn't matter... Right?

Thanks and +rep for any help...

maybe the humidity is shorting the bulbs out

your wires are crossed when the light was installed, unplug it and unscrew the bottom and move the wires around

Well it is just an extention cord magneted to the side of the pc grow box with 4 light bulb sockets pluged into it. Looks like this

Might be that the magnet is screwing with your bulbs?

Just got an email from the mrgrowpro.com he says that I need a step down converter since the power in the us is diff here in oz