If I create a menue to show a special instance for example Toyota Sedan XL and I click on this menue the breadcrumbs show a courious behaviour. Why is this?

Home - Car Rental - Toyota Sedan XL - Car Rental Toyota Sedan XL

Why is this?

Where as "Toyota Sedan XL" is the name of the menue item and "Car Rental Toyota Sedan XL" is the tilte of the instance in settings. But actually the menu item is enough to show:
"Home - Car Rental - Toyota Sedan XL"
The title of the instance in "add instance layout" is also "Toyota Sedan XL".

If I click on a link "Details" in my "show all instance layout the breadcrumbs should show:
"Home - Car Rental - Toyota Sedan XL"
and not the long meta tag title of the settings: "Home - Car Rental - Car Rental Toyota Sedan XL"

You also can check our frontend website. Maybe it is more clear for you.

Home - Car Rental - Toyota Sedan XL - Car Rental Toyota Sedan XL
May be you right, but as me seem this also correctly.

not the long meta tag title of the settings: "Home - Car Rental - Car Rental Toyota Sedan XL"

Please check: In Instance settings - you set "TITLE" and for breadcrams, and for meta, and for cart ...
We haven't other Title for Instance. If field "Title" in "Instance setting" - is empty, we use as "Title" field which you mark as "Title" at time fields creation

Regards
OrdaSoft team