I don't know if anyone has already asked this, but something has been on my mind lately.

When Harry saw the vision of the young Grindelwald stealing the Elder Wand, was it before or after he met Dumbledore? If it was before, then when he was defeated by Dumbledore he may not have been in possession of the wand as Dumbledore may have taken it from him during the battle that killed Ariana. Is this important or is it just me going mad?