03-22-2016 12:16 PM - edited 03-22-2016 12:17 PM
You redefined or deleted a custom format in SAS Studio, but the first format you entered remained in effect. It's not your imagination. It's a bug and we're aware of it and working on it. Details and a link to the workaround are in this article by @allisonmahaffey, How to circumvent a bug when you re-define and delete formats in SAS Studio 3.4 and 3.5.