This type of trading can create problems. On another stock recently I had 35 filled out of an order of 50,000 @ 5.1c. The price since has not been lower than 5.3c. With brokerage added to the 35 shares I am holding an expensive, non marketable parcel.
At least here it looks as though the seller and buyer of the 1 share, then 4 shares has followed up with 9995 to round it off to 10,000.