Blog post paragraphs & Image allignment

Hi all,

I am a new wordpress user and have started using Hestia theme for my website and blogging. I have encountered the following issues in my blog post.

1. The alignment and justification in the paragraphs are done in the post editor but once the post is published, the paragraph alignment changes by itself. But when i open the editor, it looks perfectly fine.

2. The same thing happens with the images. I define a particulate size to the images in the slider but after publishing, it will be in a different size in the published post but when i open the editor, it looks totally fine when viewed from editor.

3. Also when i type the caption for images in the editor, it looks aligned to center but when viewed on the published site, it will not be centered.

I tried using TinyMCE advanced plugin, but it doesn’t have a slider option for images.

kindly request you to suggest any possible solutions for this issue.
Thanks in advance

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