I updated all masternodes to 10.15.13
But i have
Inactive (0%) problem in some.
What is the problem?

I had the same thing on a couple of my MN's
i just now tried to start it up on the local wallet as well. will keep you posted on if that works for me.
Yea I have all my MNs as "inactive"
there too. And the balance is slightly off on one of them as well. Sup?
I've got the same.
Masternodes that were running 10.14.1 and are now running 10.15.13 are showing as inactive, but
darkcoind masternode list | grep is working and they are accepting payments.
New masternodes, created from scratch, running 10.15.13 are not showing up and
darkcoind masternode list | grep is not working.