The reasons are two-fold: 1) You entered-in those blasted, incorrect back-ticks (`) instead of the correct apostrophe (') ... and 2) I failed to follow my own instructions and just plopped-in the full dog name, without first checking for ESTRELLA, only
The system won't allow you to enter-in an exactly duplicate dog, and because I already have the name exactly correct, you cannot "correct" your incorrect dog into the same name as I have already entered.
So I will transfer your entry's 1 offspring over to mine, and delete yours, because I cannot change your incorrectly-punctuated entry into a correctly-punctuated one, because I fugged-up and entered it in there already as a duplicate
Jack