I’m sorry to hear you bees have swarmed. There are many possible reasons and scenarios.
There are a few topics on the forum about it, e.g. How to encourage bees to fill the Flow Frames
If you would like some personal Flow Frame troubleshooting advice, I would recommend that you contact customer support with your order number or email address you used to order, along with some photos or videos so that we can give you some personal advice.