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There could be several reasons why EF6 is unable to load all the children:

1. Lazy loading is not enabled: By default, EF6 doesn't lazy load related entities unless it's explicitly enabled. If lazy loading is not enabled, then EF6 will not load all the children.

2. Circular reference: If there is a circular reference between entities, EF6 may not be able to load all the children as it may go into an infinite loop.

3. Database connection issue: If there is a problem with the database connection or the query used by EF6 to load the children is incorrect, then EF6 may be unable to load all the children.

4. Incorrect mapping: If the mapping between the entities is incorrect or incomplete, then EF6 may not be able to load all the children.

5. Too many children: If there are too many children to load, EF6 may not be able to load all of them due to performance issues. In such cases, pagination or filtering can be used to load only the required children.