Sorry if this is a know bug. But if you have a horizontal flyer, the preview show the text as vertical and not horizontal.
https://www.zazzle.com/silver_glitter_budget_wedding_save_the_date_flyer-244985820096313243?view=113731688311489632
@Scott I just found one that’s still not viewing correctly https://www.zazzle.com/elegant_green_celebration_of_life_memorial_program_flyer-256093320994182288
Thank you 
Engineering is aware, and we’re working on this now.
Thanks for sharing an example product.
This issue should be resolved, however your browser cache will still show the error. If you were to clear your browser cache you shouldn’t see the issue anymore.