The Philippines' election commission has been forced to admit that the biometric data of some citizens who submitted it for an electoral register has been lost due to a technical issue.Citing a “glitch”, Comelec spokesman James Jimenez said that only a small number of citizens who registered early in the process had been affected.Biometric registration is a requirement to vote in next year's elections and includes a voter's digital photograph, signature and thumbmark.Jiminez said Comelec have written and otherwise informed affected voters “to come in and provide biometrics again.”The admission comes as the body is being forced to make repeated pleas to Fillipinos to submit biometric data before a deadline.Poll body estimates around four million voters still have not entered their biometric data and face disenfranchisement if they fail to do so when the registration ends in October – the election is scheduled for May 2016.Bemused net commentators have taken aim at Comelec of the deletion of biometric data, saying back-up procedures must be strengthened in future.