Why are wasp on my window?

For the past two weeks, there have been 6 yellow jackets just sitting still on the window of my back door. If I jar the door they will all fly away then come back 20 minutes later. You can walk in front of them and they will not move. They don’t seem aggressive. I just don’t understand why they have been just... show more For the past two weeks, there have been 6 yellow jackets just sitting still on the window of my back door. If I jar the door they will all fly away then come back 20 minutes later. You can walk in front of them and they will not move. They don’t seem aggressive. I just don’t understand why they have been just sitting there for weeks. There isn’t a nest, they just sit in the open.
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