José María Araya Valverde 🇨🇷 (chema), I have changed the way the clock is measured. Please let me know if problem persists (the first warning about the clock being wrong).

José María Araya Valverde 🇨🇷 (chema), I have not pinned down the clock warning message. I think it happens when you've been on a page for a while and click the back button.

I think the version error happens when both players click the check in button at exactly the same time!

I'll keep this open and investigate.