Menu doesn't refresh

Hi everyone,
I started out with a new wordpress account and website using the Oblique theme.
I played a little with the different options and now have the following problem:
I created two menues which I wanted to add to the primary menu location (which is also the sidebar) by using the sidebar widget NOT the option “primary menu” location. This is possible by adding an individual menu to the sidebar. The menus are both displayed correctly. But it also displays the mainmenu or rather all the mainmenu entries in a random order. Refreshing the page, deleting and recreating the mainmenu doesn’t change anything about it.

Help would be very much appreciated. Thanks.