Weird overflow/underflow bug

Server
1

statistics view :

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i have a weird underflow / overflow bug for a client that wasnt online or backuped for a long time 10+ months , its a portable device , and theres no internet backup configured only intern network lokal , if additional information is needed i can provide , server version 2.5.33 on ubuntu

2

i have executed “recalculating of statistics” and the bug seems to be gone now and it shows

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