I believe you messed up with copy-paste. I will explain how it works and you apply this to your environment.
When you're using chfs -a size=+1 the command increases your LV by one block but the thing is that you can only increase LV by some amount of PPs. For example if you have PP size configured to 64Mb you'd have your LV automatically increased by 64*1024=65536 blocks.
So issue a command "lsvg ", check "PP size" and count.