Auto-select first option problem

[rikreations]

Hello Marius,
Thank you for this extension, it's just what I needed, but I'm banging my head with a problem that I can't solve.
I'm importing products to magento through Magmi and everything is working well, all products are imported (apparently) correctly to the backoffice. The problem is when it gets to the 11th configurable product (each configurable have 220 simple products).
Up to the 10th configurable product, the first option of the attributes are selected correctly by the extension:

Live example:http://www.teelegend.co.uk/catalog/product/view/id/2200
After the 10th, the extension is no longer selecting the first option:

Live example: http://www.teelegend.co.uk/catalog/product/view/id/2420
After id 2420 the extension is no longer selecting the first option of the attributes.
I've been trying for some time to understand what's causing this but without any success.
I would really appreciate if you could help me to fix this.
Thanks in advance,
Ricardo