There's always a chance it got moisture in it when you did the change. The fluid can suck up moisture pretty quick on a humid or misty day. Years ago I had to add some AP racing BF on a misty day and could see a pretty significant interaction with the air while the filling the reservoir. It almost looked like the surface was boiling. Also the SST braded lines usually have a better moisture barrier because of the internal materials used. It could be a factor if you have SST brake lines and standard clutch lines. Seems like a lot of moisture in a short period of time. Guess that's why they say to flush it before every track day.
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