Hi guys,
Someone write this bnet class forum:
"Moonfire appears to refresh and continues to tick when the target it hit by Lunar Strike, but Sunfire is not refreshed by Solar Wrath. The debuff icon shows an increased duration, but it will fall off the target with time still remaining. e.g. Sunfire cast, 15s ticks, cast Solar Wrath, ticks back up, repeat until 15s pass, Sunfire will show 11s remaining, but will fall off the target."
And yes, i tested, and bugged.