Disappearance of UI controls in UI5 web app

Hi ,

     I have designed a simple web application using SAP UI5 and with HANA as the backend.It was fine during the initial phases, recently I found that the UI controls start disappearing when i change the value in dropdown and hover the mouse pointer over the controls.I am quite new to UI5..Can anyone say is this a known issue or a bug??

Please find the screenshots

screenshot 1- The initial view when values are not changed.

screenshot 2- UI controls disappearing with movement of mouse pointer.

Thanks in Advance,

Regards,

Tharun.