Um, which fields?
There are two possibilities:
a) Photoshop has some sliders moved as default. In PS, 0 is not always "zero". Some fields start at a higher value. (contrast at 25, blacks at 5?) Raw files need to be developed on the computer, and development means using those sliders. You can do this by hand or hit the "auto" button. Unlike jpeg, these sliders do not in any way damage the photo. The raw data stays the same and you can always "reset". But when things are all set to 0, the photo will probably not look good. Just like undeveloped film.
b) When you change sliders and "save" the photo stays the same, but a list of "edits" is added to it. That is why you can sometimes carry these edits from software to software. It is also possible that the camera added some of this info and PS is reading it.
tl;dr: Do not worry about where the sliders are. What matters is how the photo looks. Don't be afraid to move them. As long as the photo looks good and tasteful, its right.
And good job at using low ISO. If you have enough light, low ISO is the right choice. Just remember that long exposure times without a tripod can make the photo look blurred.
Firmware: You should update firmware, it can often improve the overall performance in many ways. (Specifically, AF in live view and SD card compatibility). You only need the latest firmware, it contains all the previous fixes.
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