Mark,
That makes perfect since. I changed my code to the following and I'm
still having the same issue. Could this have to do with the fact that
I'm copy the data and doing and insert instead of inserting the rows
and then copying and pasting the data?

Sheets("Inline").Range("IL_Resin_Temp").Copy
Sheets("Inline").Rows(Range("IL_ResDetEnd").Row).I nsert Shift:=xlDown
Application.CutCopyMode = False