PTR record won`t update
Solution 1:
That's because the PTR record isn't configured in either of these zones, but the reverse in-addr.arpa. zone of the IP block.
Contact your ISP (or who ever owns the IP address) to change it. For your IP that'd be:
inetnum: 151.248.116.0 - 151.248.119.255
netname: REGRU-NETWORK
descr: Reg.Ru Hosting
country: RU