This is normal, and perfectly demonstrates the advantage of shooting raw.
It also perfectly demonstrates why you should do as much as possible in ACR/Lightroom before opening it into Photoshop.
A raw file contains all the data captured by the sensor, linearly recorded in 14 bit depth. If you could see it, it would be a very dark, monochrome image, and, notably, very tonally compressed in order to fit all the data. A good modern sensor has a dynamic range of up to 14 full stops.
When the file is processed and rendered into a color space, with gamma encoding, a great deal of this information is discarded. It has to be, to produce a useful recognizable image. Once gone, it can't be recovered.