Memory_target and memory usage reported by windows taskmanager

Hi,
shouldn't Oracle 11g limit the amount of used memory (reported by windows taskmanager for process oracle.exe) to the value of "memory_target" (which means using automatic memory management)? My database running on Windows 2003 R2 32bit (RAC) is constantly consuming more and more memory (limited to 500MB, currently using 741MB), until it reaches the limit of 1.7GB, which one process can use. After this the database fails.
The database is hosting three very simple applications, no challenge for Oracle. :-)
Thanks in advance,
Frank

short update: both database instances are configured for 500MB "memory_target" and currently one database is using 877MB virtual memory and the other one 784MB of virtual memory (according to windows taskmanager, process oracle.exe). One of these instances is a recovery catalog, doing nothing at all (at the moment).
I'm really worried where all the memory is going to!

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