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As you have firmware version 4.15.12930, there are two possibilities I can think of. Which it is probably depends on whether it is all book, or just some. And the format you read.
With firmware 4.15.12930, there is a bug when reading epubs that don't have every internal file in the ToC, or have extra ToC entries. With this, if you close the book in the wrong place, it will reopen at the start of the book. There will also be some strangeness with opening the ToC and what is selected. This is the likely reason if you are not seeing the problem for all books. Updating the ToC in the book is the only workaround. Hopefully Kobo will fix it in the next release.
The other likely reason is a corrupted internal database. This will usually mean that the reading position isn't updated for books you were reading when the corruption happened. And opening a new book will probably not remember the status if you power off the device. You can test the database with an SQLite database manager, or my Kobo Utilities plugin if you are a calibre user. Unless you have a recent backup of the database, you will need to sign out of the Kobo account on the device recreate the database.
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