Gasoline analogy: It is advertised as 2.569 but when you buy, say, 9 gallons of gas, it is $23.121. You pay $23.12 or $23.13 depending on the rounding method (closest to zero or next highest whole number).
The game is displaying whole number values only. You are receiving 4.65c per arrowhead but you're probably going to see 5c returned to you, as it is being rounded. In another instance you may see 4s but it's only giving you 3s 9c because it's possibly 3.93s. It's not funny math, it's just basic rounding.
Keep in mind that modifiers exist (CHA, faction) that are adjusting those values, as well. I don't know if it's a % modifier but it would explain the fractions of copper and silver. In the end, however, it's pocket change. Over the course of actively playing on this server for a year you *may* waste a few plat depending on the over/under rounding. If it does bother you, though, like you said, just use CTRL when you sell.
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