Playing with all DLC/expansions except frontier pass. I was testing this out on a modded game, so don't know for sure if the mods are the issue. I was also playing as England, so maybe their unique harbour is bugged? I see no apparant change in unit movement embarking to or from Harbours. It still costs 3 points. I do however see this effect when moving directly from a city to water (costs 1 move points instead of 3). This happens in any city, regardless if it has a harbour. Also 1 weird thing I noticed is I could embark a knight, using 3 of his 4 movement, then immediately disembark him to an adjacent land tile with his last movement (no cities or harbours in those tiles either). Please let me know if any of you guys have the same issue, or know what's causing it. Thanks!