Multi wan and keep state problem

[glukolog]

Setup: two ISP on two VLANs, ISP1 - main, ISP2 failover channel.
use this for setup: https://doc.pfsense.org/index.php/Multi-WAN_2.0
Problem: ISP1 down, connection estableshed through ISP2.
  ISP1 going up, connection steel through ISP2.
For example: ping www.smg.com and see TTL
Workaround or may be solution:
  system->advanced->misc
Allow default gateway switching  = On
State Killing on Gateway Failure  = Off

In file /etc/inc/gwlb.inc
after line: mwexec("/sbin/route change {$inetfamily} default {$gateways_arr[$dfltgwname]['gateway']}");
add line: mwexec("/sbin/pfctl -Fs");