Hello udhakal,
I am reposting the content of the linked page below, as I am not able to reply with an attachment. Please note that this is an old issue which has already been addressed and you should not see it if you are running on the latest 5.7 version.
This issue was originally reported in October, 2010 as an issue in application templates. 
We have a problem displaying the CalendarView properly using IE8 browser. It seems to work fine in Firefox. It has not been easy to reproduce this issue repeatedly. Customers have reported this in their SP2010 environments on various occasions, and currently the known workaround to this is to set browser setting (Document Mode) to IE8 standard, and not use IE7 or IE8 Compatibility view modes. You can access these settings from the menu when you hit F12 in your IE browser.