It seems like when opening a video or paragraph today that you already learned a part of it yesterday, the previous read content are also added to the Already Read count, which results you having an inflated Read count.
I’m still facing this issue. You can reproduce this issue by reading a video or article for the most of it, wait for a day, then open the item again, your Linq will include the content that you read yesterday.
I had a similar issue a while ago, after I moved to another country. Maybe it’s the same one? Have a look at your profile settings. Is the selected time zone the right one one for you?
I don’t think it’s the timezone issue. For example, I have 2000 linq yesterday while having two video open in my browser with unfinished video. I created one new linq today with the unfinished video and suddenly my today lingQ count in 1000.