fee higher than normal, with priority fee

On devnet, usually my tx fee is 0.000005 Sol, for simple transfer of sol or token.

But, today I got several simple tx with fee higher than normal, with priority fee.

tx & fee list:

Questions:

    1. Why these tx has fee higher than 0.000005, they are just simple tx, is it due to there are too much tx on devnet at the time when the tx is broadcast?
    1. How can I limit the fee to 0.000005? Or, set another upper limit.
    1. Who sets the priority fee in the above tx? I didn’t specify such param I guess.

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