Front-end and back-end button aligment are different

Hello,

I made all my pages with gutentor and i was very happy of it, but i have problems a few months later. My problems are with the block ? button ?.

It began with the the alignement option (left – center – right) that doesn’t work properly. There aere differences between back-end and front end (I put the center option on while it’s lest on front-end)

I changed the property of the aligment button but it doesn’t affect my page, sometimes yes but later….

And now all the text of the blocks button are strikethough text….

Any ideas of how i can fix it ?

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