Also experienced this when exporting images (PNG/JPG).
The export window shows the exact size (for example 2475 x 3150 pixels including bleed), but when you export it, the final size is 1 pixel higher (2476 x 3151 pixel).
I worked around that by making the bleed 1 pixel smaller. The export window then shows 2474 x 3149 pixel, but exports the needed size of 2475 x 3150. Very annoying, but still usable.
It seems, this happens only with higher resolutions, smaller picture exports (like 50 x 70 mm / 600 x 825 pixel) do not have the problem. Maybe a rounding error in the export window on higher numbers?