Fun with Query Builder

I cannot explain this.

SELECT SI_ID, SI_NAME, SI_CUID FROM CI_INFOOBJECTS WHERE SI_ID=23
1/1
Properties
SI_NAME Root Folder
SI_CUID ASHnC0S_Pw5LhKFbZ.iA_j4
SI_ID 23
SELECT SI_ID, SI_NAME, SI_CUID, SI_PARENTID, SI_PARENT_CUID
FROM CI_INFOOBJECTS WHERE SI_PARENTID=23
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Properties
SI_NAME Report Conversion Tool
SI_CUID AY9zJ8BgaF9OucZ2h2slcJM
SI_PARENT_CUID ASHnC0S_Pw5LhKFbZ.iA_j4
SI_PARENTID 0
SI_ID 123

Why the hell SI_PARENTID=0 in the result if SI_PARENTID=23 is in the query restriction?