In this matter, to complain is of no use. lot of things can lead to different results.
Earth is vast Perhaps PS is buggy or viewing conditions are not the same or PS applies some processing or many other things…use of PS proves nothing. To view jpg better use a color managed viewer.
If you really want to get an explanation or solution to your DNG problem, the only way is to provide a bug report (see http://rawpedia.rawtherapee.com/How_to_write_useful_bug_reports:
- your system, RT version
- the initial raw file
- the detailed process (which sw, version…)you used to obtain a DNG
- the pp3 for raw file and DNG file
- What you observed exactly
Unless, you will get no real explanation.