Back button not working if going two levels back

Dear Friends and Vladmir

Sir kindly check the app on this link

If you click on the Following links SPLASH icon or HomePages icon in bottom bar

you will notice that coming back to the home i.e index.html is not possible if you go two levels deep. but if you go to components page from there you can go inside multiple levels but coming back to homepage is not working , kindly help

Kindly guide me what to do in order to fix this issue