I need some help.When I upload photos to lrc and I'm in develop mode,when I move on to the next photo,it displays normally,but after two seconds it becomes darker than the original shot.What could be causing this?Or what am I doing wrong?

Are these brand new photos, that have never been in LRC before, just imported? Are they RAW images?

If so, LrC displays the embedded JPG in the RAW file until it can render its own version of the RAW image, and then it shows the RAW image which will look different than the embedded JPG. This is perfectly normal, and cannot be turned off. You can, if you want, create presets that can be applied at import to make the original appearance of the RAW more to your liking.

PS: In the original dialog box where you create your question, it asks you to Briefly Describe your question, my emphasis on the word “Briefly”, so that could be something like “Image turns darker after 2 seconds”. In the next dialog box, you describe the problem in detail. We don’t need a 42 word “Brief” description and then the same text in the body of the post.