We are actually noticing a similar thing, but for us it doesnt seem dependent on whether or not the item has variations. Instead, it depends entirely on *where* we receive the stock -- that is, on which screen we receive the stock.
If we are in our Item Library and click on a variation from the main listing (rather than clicking on and opening the item), a small "Edit Variationo" popup box comes up; if we receive stock there, the unit price properly updates in the item.
If, instead, we click on the item, navigate to Variations, and receive stock there ... the unit price does not get updated in the item.
In both cases, History always shows the correct unit costs.
