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Just guessing (since your step data is only visible to friends): 110K and 89K were your steps for the last six days, plus the ongoing day. The total count will increase until Midnight on the ongoing day, at which time the oldest day is dropped and the new day that just started is added. You are not "losing" steps, the fluctuation is normal.
Dominique | Finland
Ionic, Aria, Flyer, TrendWeight | Windows 7, OS X 10.13.5 | Motorola Moto G6 (Android 9), iPad Air (iOS 12.4.4)
Take a look at the Fitbit help site for further assistance and information.