IPTC search broken

[negg]

This is the setup:

When I do a search for ITPC Keywords with the setting "With at least one of these words" I get different results depending on the sequence of search word. E.g.: with a search string "Adam Eve" only images that contain "Adam" or "Adam"+"Eve" are found, but not images with "Eve" only.

So only images with the first or both search words are found. Images with only the second search word only are not found (but should be).

Or am I getting something wrong here?

[xnview]

Yes, right