PPTP VPN works fine, but not for DHCP static IP

Hello all,
I have strange problem. I have configured pptp vpn with separate vpn pool. Everything work fine, but I am not able to connect to internal lan pc, with static record assigned by dhcp (DHCP Lease/Make static). With dynamic assigned IP there is no problem, only with static lease. And of course - PC with manual defined IP have no problem too. I can easy solve this problem - manual assign IP on each PC, but why it does not work?
Any idea?

Thank you
OggO