Could Isildur have been confused by the Ring? If it had started it's famous love-hate game with him, he could have wished both give it away and keep it at the same time. Elrond was with Isildur at the Cracks of Doom and tried to persuade him to destroy the Ring. Isildur could have thought that unlike to himself, Elrond was able to have it done and he needed to bring the Ring to Rivendel, but secretly. At the same time Rivendel was far away and the Ring could have influenced Isildur to take this long way as he didn't need to give it away too soon. He could also have been reluctant to bring it neither to Lorien, nor to Kazad-Dum, as there was a risk that someone else clamed it there.
These are some reasons that look possible for me.
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