To save others the typing,
GraphicsRow[{
Plot[Sin[x], {x, 0, 10}, TicksStyle -> Directive[Orange, 16]],
Plot[Sin[x], {x, 0, 10}, TicksStyle -> Directive[Magenta, 32]] }]
On my Ubuntu 12.04, Mathematica 10.0.1 gives different styles.
Suggestions:
If you try this input in a new Mathematica session, do you get the same misbehavior?
Reset Mathematica initialization files to default values by starting Mathematica (in a terminal window) with the -clean option. Example:
mathematica -clean &
Send a copy of the notebook with GraphicsRow input and output, and the output from $Version to support@wolfram.com. Mention this Community discussion, 368982.