Counting is not accurate

The counting of my "already read" mangas are not correct. Normally i always add them mangas to my google keep notes and always put numbers on them and i don't know why but i'm supposed to have 1109 but its only 1108. I confirmed that the counting is wrong because I last checked it when i have 1104 but when i read 5 more it started appearing 1108. Maybe technical malfunctions but there is nothing wrong with my connection