[TYPO3-mvc] Wrong Extension Key?

[David Schreiber]

Hello everybody,

My first Extbase extension (kickstarted with the extbase kickstarter) 
does some very strange things on installing with the T3 extension 
manager.

My typo3conf/ext/ folder normally looks like this:

typo3conf/ext/
|
|- blog_example/
|- extbase_kickstarter/
|- rrmarket/      <-- my extension
|- templavoila/

When I click the install button of my extension inside the extension 
manager, and make my updates to the database tables, something really 
strange happens.

The folderstructure typo3conf/ext/ now looks like this:

typo3conf/ext/
|
|- blog_example/
|- Classes/
|- Configuration/
|- extbase_kickstarter/
|- Resources/
|- rrmarket/      <-- my extension
|- templavoila/

All my extension folders (generated by the kickstarter) are copied one 
level up. Also some strange things happen inside the list module (my 
extension's data is displayed in the same category as the templavoila 
data).

What could be happened? Have I forgotten to set some extension-keys or 
folder settings?

Help would be appreciated,
David Schreiber