post showup half in mobile version

Try deactivating all of your plugins to explore whether any could be responsible. If none are, keep all plugins deactivated and switch to the Twenty Seventeen theme to check whether it’s an issue with your theme.

It’s a case of narrowing down the problem so you know where it’s coming from. Did you say it’s a problem with the theme? If so, which theme are you using?

Could you create a support topic on your theme’s section here: https://wordpress.org/support/theme/placid#new-post