Legacy Cumulus 1 release 1.9.4 (build 1099) - 28 November 2014
(a patch is available for 1.9.4 build 1099 that extends the date range of drop-down menus to 2030)
Download the Software (Cumulus MX / Cumulus 1 and other related items) from the Wiki
Did you change units after you had already been running Cumulus? Perhaps not...
Anyway, it doesn't really matter; as you've only just started using Cumulus, the easiest thing to do is to stop it, then delete all of the files in the data folder. Then start it again and see if you get any of those high figures again. It may just be that your station is sending these high values, Fine Offset stations sometimes do that. There are 'spike removal' settings in Cumulus to help to filter them out, but if your station is sending bad data quite frequently, you should really try to see if you can improve your set up.
But the first step is to delete the data and take it from there. What version are you using?
You're not running Easyweather at the same time as Cumulus, are you?