thanks for the head-up;
i've had the same problem some time ago, but this time is different: all the files were ok, i even put them on jdownloader queue, but after half an hour they just disappeared.
this is the first time i see or hear about this, so i hope it was just a glitch on HF part uzzled:
They might be matching files by hash value, so if you re-upload something that was previously reported as a violation, it gets deleted. Just a thought.