Lost some Results

This is normal behaviour. Take a look at the following....

From the Boinc FAQ Service...the information is also available in German...;-)

Where did all my results go?
Wohin sind meine Resultate verschwunden?

Once a task has met it's quorum as set by the project (typically 3 to 4 results), all results are compared against one another. Once the results are found to be satisfactory, they are assimilated into the project's Master Science Database and removed from the servers to save hard drive space.

The amount of time a task stays viewable depends on how long the deadline is and how quick the other systems return their results. It is entirely possible for some results to get lost in the server's hard drive and stay for up to a couple months which, at that point, the project Admins would need to manually intervene and clean up the database.

It is estimated that if the results were left available, some projects would need multi-terabyte hard drives and enough RAM to cache all the information for quick access or the entire database would slow to a crawl.