I'm using the latest version of Lightroom Mobile on iPad Pro 10.5 and have the following problem.
When I make a DNG raw photo with Lightroom Mobile on iPad and want to edit it further, everything is good as long as I don't choose reset (all, to import, to open).
When I chose reset, the dng file gets dull and looses its contrast. Much more dull than it was before any editing took place. Unfortunately this change seems to be destructive as it is not possible to undo it with the undo buttons. Even if you reopen the image it stays dull.