Thank you for the answer. I knew the standard extent size is 64kb but was thinking that maybe there was a mechanism for escalating the size [similar to what Informix does].

At this point in time since there was not a mass insert or update of the table data [or any added columns, changed data types, etc.] I suspect that when the size was recorded a while back a mistake was made. [either we used the data pages and forgot to multiply by 8 or something else happened.]