Calendar is displayed incorrectly on the site page

HI, i meet a calendar bug

from my computer : screenshot

Hi,

Please disable third-party plugins and customizations (if there are any) and check if this issue persists. If you use a caching plugin, make sure that caching is disabled for logged-in users.

If this issue exists, please send more details that may help to detect or reproduce this issue (e.g. a link to your site, your actions step by step).