Lotus using extra 25% gas cap even no network congestion

[flyworker]

Describe the bug
While my lotus send a message with a much higher gas cap than current basefee? 4.854533891 height 293155 nanoFIL vs 2.025 at height 293165
message id
https://filfox.info/en/message/bafy2bzacebbqljqhfmm2zxx4z2ntyifm32rujylvpco3jdy5ij4hygukzhyp4
Gas Fee Cap tip:
4.854533891 nanoFIL

Gas Premium tip :
100,315 attoFIL

Gas Limit tip:
10,299,650

Base fee history
https://filfox.info/api/v1/stats/base-fee?duration=24h&samples=48
{
“height”: 293124,
“timestamp”: 1607100120,
“baseFee”: “2025893537"
},
{
“height”: 293184,
“timestamp”: 1607101920,
“baseFee”: “2041509849"
},

If this is the default behavior of lotus sending message mechanism, it might cause everyone increase gas fee unconsciously.

To Reproduce

Steps to reproduce the behavior:

1. open https://filfox.info/en/message/bafy2bzacebbqljqhfmm2zxx4z2ntyifm32rujylvpco3jdy5ij4hygukzhyp4
2. open https://filfox.info/api/v1/stats/base-fee?duration=24h&samples=48

Expected behavior
Gas cap should be equivalent or slightly higher than base fee.

Screenshots
If applicable, add screenshots to help explain your problem.

Version (run lotus version):
lotus version
Daemon: 1.2.1+git.df66f48f6+api1.0.0

Additional context
Add any other context about the problem here.

[jennijuju]

as kubus mentioned, 25% is for gas limit overestimation not for gas fee cap. And gas estimation improvements are discussed in filecoin-project/specs-actors#1319