I've generated a histogram of my data, using their log values, and exported the resulting plot as pdf. To my surprise, the ticks in exported plot were replaced by the logarithm of the ticks in the histogram in the notebook (please see MWE below).
This inconsistency seems to be a bug to me. I'm using MMA 11.2 on Windows 10.
Histogram[RandomVariate[NormalDistribution[0, 1], 1000], {"Log", Automatic}]
Export["wrongTicks.pdf", %]
{"Log", 10}
$\endgroup${"Log", {{0.001, .01, .1, 1, 10, 100}}}
or{"Log", Automatic}
to{"Log", 5}
. The second evaluation of the same code exposes the same bug.) $\endgroup$