Offset srf UV change problem!

Hi there,
i have a problem both with rhino and grasshopper. I have built up a half sphere using revolve command and imported it into grasshopper. Then i have offseted that srf and divided that srf by using divide domain 2. Than i have seen that the U-V of offseted srf is acting weard!. Is anybody face this problem before or maybe i am doing something worng! (8.9 KB)
cm.3dm (162.4 KB)