Sticker triggered false onExitedRegion

I made a android app to monitor my stickers, however, after I added setBackgroundScanperiod(1000,0) and setRegionExitExpiration(6000) , my app triggered onExitedRegion (which popped out an alert) even the stickers are next to my app, which didn’t make sense.

Am I doing something wrong or there is a bug on SDK. Hope someone can solve my problem.

Below are gif and part of my codes .

please click on the gif if you can’t see it.