Columns disappear when using “View entire message” in gmail

[JapeNZ]

Hi there,
For some reason if the newsletter I send out is quite long and you need to use the ‘View entire message’ link in gmail to open the newsletter in a separate window, the columns are no longer used.
Instead of seeing three columns of products, and text, there is now a single column.

Any idea what might cause this?

Thanks for your help!

[Author]

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