What is Relaying BTC Header?

Today, Transactions and Mempool screens in incscan are filled up with “Relaying Btc Header” Txs. What are these? It makes the network (in my case, trades) really slow. The trades were super fast yesterday. What happened?

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It’s related to Portal v2.

It seems there was a lot of tx about that yesterday because of a catch-up.

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