Following points are seen on thematics on ODF

Point 1 : (on creation) : 

• Create a repeater entry. Fill mandatory field "texte" : 

• Click on "+" button to add another entry. 
• Do not fill mandatory texte field of this new entry
• Click on button to down first entry. 
• Second entry is set on the top, but it is not possible to fil mandatory field "texte", focus is not set on it. 

Point 2 (on modification) : 

• Open a repeater containing 2 entries in modification. 
• Down first entry
• 2nd entry is set in first, but mandatory texte field is emptied : 

Note : it seems to be a graphical bug (if user saves, field is present)