Lag on, where is this? While using the telegram bot earlier? Maybe it's the time i'm adding/fixing the new about button earlier? If it's on the bot maybe just a temporary downtime.
I've been using your telegram bot right after you made it public here.
I noticed the complete accident while I was online, I had a change in my karma count and one mention, but the Telegram bot sounded with a solid delay. The reason may be that you worked on it by adding new things.
I don't think it's a serious problem, as long as the notifications arrive.