Put three charts side by side and Power BI scales each one on its own. A tall bar in the first chart can stand for a smaller number than a short bar in the second — so the comparison your reader makes by eye is simply wrong. The fix is to give every chart the same top and bottom on its value axis, and to keep that range moving as slicers change so it never clips the data.

Doing it by hand means writing a pair of min/max measures, getting the spacing right so data labels aren't cut off, then setting the axis minimum and maximum on every chart one at a time — and redoing it whenever you add another chart. This skill builds the shared range and points every chart at it in one command — run it with /sync-y-axes.