This is most definitely still a glitch with improper handling of signed/unsigned numbers resulting from a small time desync. As for LibHistoire, I'd contact @sirinsidiator about it. If an addon, such as LibHistoire, sees that the time was 4 billion seconds ago, it should be pretty easy to treat it intelligently as the negative that it was supposed to be.
perfiction wrote: »Same thing happened here, but it was a result of incorrect datetime in Windows (dual booting Linux/Windows messed up my timezone). Once I force closed ESO, fixed my timezone and restarted the game, the sales got fixed.