I rechecked all my PS2 Playstation Magazine demo submissions and found a couple more with wrong sizes.
 
Demo 63
http://redump.org/disc/14077/
Size should be:
4,524,048,384

Demo 66
http://redump.org/disc/14079/
Size should be:
4,630,446,080

I have no idea where the incorrect sizes came from. I'll just try to be careful in the future.

Try restarting IsoBuster every time you insert a new disc in the drive.

"Did you ever wonder why we had to run for shelter when the promise of a brave new world unfurled beneath a clear blue sky?"

That's not the reason RetroGamer, otherwise his dumps would be complete wrong

PX-760A (+30), PX-W4824TA (+98), GSA-H42L (+667), GDR-8164B (+102), SH-D162D (+6), SOHD-167T (+12)

I'm getting the file size from Window's 'properties' menu. I do know that if I open the properties box for 'track01.iso' and don't close it, then replace track01.iso with a different same-named file, Window's will just bring up the old 'properties' box for the new 'track01.iso' (which will have the incorrect size). I'm usually really careful to make sure that doesn't happen. Plus, I use the database to scan and auto-name every ISO I submit- just to verify that the information I submitted matches my actual image.

During the time when redump's site was down for awhile, I couldn't submit dumps or download the updated database so I was recording the info on a text doc. I guess I made some bad mistake in copy/paste and never caught it because I couldn't get the updated database for awhile.

Would it be a good idea to make the PS2 DVD submission form accept the SIZE/CRC/MD5/etc info in CLRMAME dat format (like it does for CDs)? It might eliminate some stupid human errors (like mine) made by copy/paste-ing each field separately.