Welcome to the forum. Surprised the Rover, with such a short scale, is giving you intonation grief. Are all the strings fretting sharp or just a few?
Few things to check out.
Is the action at the nut high? If so, that will tend to make the guitar play sharp, particularly chords played in the first few frets.
Is there excessive relief in the neck? Same thing, but less of an issue in first position chords.
A compensated saddle may help, particularly if it's not an overall problem but just on a few strings.
if you are not comfortable checking all this out and fixing it yourself you should have a luthier do a proper set up and evaluation.