It makes perfect sense.Its because one person sold an odd amount...

It makes perfect sense.

Its because one person sold an odd amount which cascades down and affects the rest of the orders because it means when someone buys a full amount i.e 100,000 the person selling to them still has a residuel amount - the 18 or whatever shares.

Hence why you'll see the opposite end of the spectrum, orders ending in 88 will also see orders ending with 12. The total makes a round number.

Am I making sense? There doesn't appear to be a "code" of any sort to me.