I've just asked and can confirm that in the included historical data files, most ticks are minute aligned. So normally one tick is indeed identical to a 1-minute bar, other than in my example above.

To avoid confusion: "Ticks" here mean the raw data as received from the price server, consisting of HLOC prices and a time stamp. If a tick contains only a single price quote, H L O C are identical. But normally they have wicks and look like a normal candle.

So, all is fine, at least I do not know of a mystery about ticks and bars. You can easily see the raw ticks when you plot a chart of 1-minute bars: