Those transactions do not look like transaction send from exchanges that the withdrawal fees are very high. The sender mighty have made a mistake and used too high fee. There are some people in the past that mistakenly used too high fee. If it is because of a reason, I think the senders will be the one that can best answer the reason.
Yeah, this is one the reason I can think of too because I almost did the same mistake 2 days ago when I was making a transaction. The other one is those people who are in a hurry to make the transaction, they will pay as long as it goes in quickly. The former is what happened to me.
The default in using the Mycelium application became 137sat/byte and I almost clicked the send button before I realize how much the fees are. The normal fees were just 20-30 sat/byte weeks ago and I had been doing it without any issue. I also tried finding out why there's heavy traffic, but I cannot find the answers anywhere.