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LM3550: EOC and Flash issrue , FGATE is set to 0

Part Number: LM3550

1. Super-capacitor's charge mode level is set to 5V,  EOC shold become to 0 when level reached to 4.75V, but in fact, it become to 0  only when charged level above 5V, such as 5.03V
    charege: reg addr 0x10  val: 0x12
  
2. Led cant't flash,  if charge mode is set to 4.5V, even if EOC has become 0
     Super-capacitor voltage is charged to 4.6V, and EOC also has reached to 0.
     After a failed flash, EOC become high level,  but led can't be lighted, and Super-capacitor's voltage also didn't decrease!
     Under this condition, we charge Super-capacitor to 4.93V , then the flash can work, led can be lighted, it is stranged!
    charge: reg addr 0x10  val:0x0A

Wish get your help,thank you very much!