Browser Forward To Wrong Page

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When I press BUY NOW and get the shopping cart for a few seconds, I am then re-directed to www.homebits.co.uk/acatalog/index.html. Which is fine, but this page does not exist.

What have I set up wrongly to cause this to happen?...

click-through.

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It Fixed Itself!

Incredible...

I just looked at the site again today and the problem has gone away. I'd like to know why it was there in the first place, but maybe I should just be grateful?...