Brave browser started any carry forward bat token system?

Past two month I’m seeing that brave browser not pay full amount and
Some bats carry forward to another month…
Last month 20 bats carry forward and this month had 25 bats and received only 13 bats and 17 bats carry forward??
Uploading: Screenshot_20200901-062255.jpg… And
I just forget the publisher account because most of my friends using brave browser because of me 4 months and
I can see only confirmation in the count…
every month same payment issue why ??
Why dnt u ppl find suitable wallet which dnt have issue like current one or why dnt brave browser create separate wallet for bats .If brave have separate wallet then we will hold some bats too …