Hollydurg, I am making an assumption about the nature of your question, If my asumption is wrong, please ignore. I am assuming that you looked at your investment account this morning and expected to see the value of POET at $1.82, which was the closing price. The way the market value is determined in your account is not the closing price, but the last bid. Yesterday, the last bid was $1.79 at closing, so that will be the market value (which is 3 cents lower than the closing price).
Cheers,
Quan