Don't worry about the shutter count. If it's working OK just use it. It's very unlikely that the shutter is worn out. I believe that 150000 actuations has been quoted for the X-T3, but that from memory. It's going to be at least 100000 though.
I forgot to mention. To see the images correctly on the camera you can check some settings. Make sure that evf and lcd color are set to 0. Likewise lcd color adjustment (you can tweak these later if necessary). More importantly make sure 'natural live view' is off. These are located in the 'spanner' section under 'screen setting'.
Can you describe the difference for us? What software are you using to view them on your computer? Do they look, the same on another computer and monitor or on a tablet or phone? Is your monitor calibrated? Most monitors that are not specifically made for photography are too blue and too bright out of the box. If you don't have a colorimeter, and your Images look OK on other devices, you can try adjusting the monitor using its controls.
Last summer I sold my whole Canon setup (5D mkiii, 35mm, and 85mm). I actually adored the setup I had, but the weight really bothered my body. I was very excited about the mirrorless cameras and their light weight. I went to my local camera shop and they talked me into buying the Fuji X-T3. I was a little nervous about it not being full-frame, but the shop assured me it could perform on a professional level. My first lens for the camera was the fujinon 23mm 1.4. I've been using it for portrait sessions (families, seniors, etc), and it's just not performing anywhere close to how my Canon setup performed. When I zoom in on the images, they are just not clear and crisp! Part of what I love to offer my clients is the ability to print their images bigger for wall art, etc. I don't feel like I can recommend they do that anymore. Do y'all think I need to go back to a full-frame camera? Or am I just doing something wrong with the X-T3? Thanks!