Tambo's right. That's the essential difference between what you had on-hand and what they were seeling in the airport store -- one was liquid filled, the other not. Probably if they see empty bottle full of dry plant matter, they're told to assume the worst -- that's something illegal or agriculturally undesirable that ust stay dry is hidden amongst the twigs and leaves...
On the other hand, it could simply be security people being random as they sometimes are...
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