Limit enforced before actual limit
Today players started getting a message saying they had reached their height imit even though they had not. i even increasd the limit to test and it was still giving same message but with the new limit even tho they had buit no higher . anyone or wulf do u know why ot how to fix.  othing was changed since last night in my server so not sure why it happened all of a sudden . 
Are you sure you are using the latest version of the plugin?
redownloaded it ans installing again .   i have noticed players have worked out a way to pass the limit on foundations. if u place 16 then remove 1 and then start placing foundations 1 space away  you can place another 16 reomve the last 1 and then connect them with a row inbetween .