Weird little bug, but probably doesn't affect anything.

 

I pasted some text from several existing items into another location in the grid, creating a new item for each copied item.

 

I have the "Item Created" field in the Grid as a column, just to the right of the Item field.

 

After pasting, the "Item Created" column shows the same text I pasted into the Item field.

 

The Item Created field in the Values section does show the creation Date and Time as it should.