You don't need to clear the tooltip here. It's cleared elsewhere.

diff --git a/Modules/UnitTooltip/UnitTooltip.lua b/Modules/UnitTooltip/UnitTooltip.lua
index 7e96003..b39a87b 100644
--- a/Modules/UnitTooltip/UnitTooltip.lua
+++ b/Modules/UnitTooltip/UnitTooltip.lua
@@ -1212,13 +1212,11 @@ function mod:SetUnit()
         end
     end
     -- End
-
-	GameTooltip:ClearLines()

 	lines()

 	if self.db.profile.refreshRate > 0 and self.timer then
-		--self.timer:Start()
+		self.timer:Start()
 	end

 	self:RefixEndLines()