D line

I just moved to the city and I’m curious if this is a normal thing, I’ve noticed most other bus lines are consistent with the times posted but the D line… I’ve waiting almost an hour because the app OneBusAway says a bus is arriving, arrived, and then left on time even though I’m standing on the curb and it’s nowhere. And when the D line finally comes, another D line is literally right behind it in a cavan as if that’s helpful