Iframe not loading correctly

I have deployed my application on a ubuntu server. The app works fine when accessed through http but when it is accessed through https the iframes do not load correctly.

It shows:

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXpx" width=“0px” name=“nm_iframe_liga_A_grid_tblusercontrib_dashboard” scrolling=“auto” src=“NM_Blank_Page.htm”>
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXpx" width=“0px” name=“nm_iframe_liga_E_grid_tblusercontrib_dashboard” scrolling=“auto” src=“NM_Blank_Page.htm”>

Does anyone know how to fix this?