@thanhson1085 @khaihkd on tomo scan also i see some blocks around that range which have block finality < 100 %.
For example
https://scan.tomochain.com/blocks/1056002
this has 1% finality.
@thanhson1085 for the block number divisible by 15 , the block signers value is high and so only for those blocks i am seeing high finality percentage.
For others it is low value like 25% and 28% , till which block will it continue , or it will remain the same for all further blocks.