The barometer pressure is 1021 but the barometer graph shows 1028. What’s wrong? 
it could be a few reasons:
is the graph changing…i.e is it current
any errors under view, program error log?
which time period graph do you have displayed?
(check under view,graph history, i.e 12 hour for main, or 24 or 48 or 72 hour)
also check that under setup, general and misc, you do not have ticked share the data files (this means you select a datafiles location from another running verison of WD, i.e like on another pc)