Change Pagetemplate for Home(Start Page)

I want to change the Template from Home -Mainpage to 20%80% from 33%66%100%.

I know, once a Page is created, it is not possible to change the Template. So I changed it directly in SQL Table in Processmanager Database,and this works.

The only Problem is, always i login, the Portal Starts with the old Template, when i click on the Home-page it shows the right 20%80% template. Also the Logo link in the header shows the Home-page with the Öls 33%66%100% Template .

Does anyone have a Solution for me?
Thanks.