Yaxley grabbed onto one of them (I think it was Hermione) when they apparated to escape the Ministry. So Yaxley was pulled to Grimauld Place which showed him the secret which forced them to have to use the tent.
Probably wasn't concerned at any rate he was secretly working against them so maybe he decided it best not to bet Death Eaters there, and lied about the location. Or something... Thats a good question actually.
Elf Magic is different then human magic so it probably gives them this little loop hole....
I'm a bit sleep though so I'll see if I can give the rest a good once over later.

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