Gallery on Gutenberg Block Do Not Follow Alignment

Hello Sinatra Dev Team,

I was trying to add a gallery block on Gutenberg Editor (for my client) and I want to align it to center. However, it doesn’t follow my command. It always stays on the left alignment. But, if you resize image into large, it doesn’t impose any problem, only when the image sizes are medium and thumbnail.

Do you have any codes to fix this? or any steps to follow? Thank you!

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