Pics align verticlly even when align horizontal

Hello,
As i went today to check my blog, I found that gallery images changed the alignment to vertical rather then horizontal. Knowing that i tried to edit and return it to its previous status but with no use. I have no idea if the theme or wordpress system had an update, but what is done missed my blog up.
Any idea how can I fix this issue?
and thanks in advance

The page I need help with: [log in to see the link]