get_fee_rate_statistics returns apparently incorrect data on devnet

[phroi]

Hello folks at Nervos,
I'm running a devnet for testing iCKB and I see an unexpected behavior.

Current Behavior

I have a stream of transactions with 1000 feeRate, but then when I check get_fee_rate_statistics both mean and median feeRate seems almost double. So went back to my code, I double checked and my transactions indeed have the intended feeRate, I'm not overpaying.

Also I tried increasing the feeRate to 10^9, but get_fee_rate_statistics consistently returns around double of the intended fee rate.

Also I tried setting feeRate to 999 and indeed the txPool reject the transaction as expected.

Expected Behavior

get_fee_rate_statistics should return feeRate mean and median of the past transactions feeRate.

Environment

• CKB version: ckb 0.113.0 (82871a3 2024-01-09)
• Chain: dev
• Operating system: Ubuntu 20.04
• Arch: x86_64
• Installation: GitHub Release