RT newbie export issues

Processing
1

Hi,
After tweaking an image to my taste in Rawtherapee, I exported it to a 32 float tif. When I open this tif either in gimp or Darktable, the shadow regions of the image show much more noise and artifacts than it was presented by RT preview. This is more noticeable in the red pillars of the leftmost crane.
This happens regardless the chosen output color profile. In the screenshots below, I used no ICM: sRGB / perceptual (but it also happens if I export it as REC2020)

Am I missing something?

RT:

Screenshot%20from%202018-10-12%2010-23-15
Screenshot%20from%202018-10-12%2010-23-151366×768 1.3 MB

gimp:

Screenshot%20from%202018-10-12%2010-25-06
Screenshot%20from%202018-10-12%2010-25-061366×768 1.31 MB

DT:

Screenshot%20from%202018-10-12%2010-40-55
Screenshot%20from%202018-10-12%2010-40-551366×768 1.24 MB

2

Sorry, don’t want to bump the thread, but only now I noticed, the greyish building at right shows a lot of noise in gimp and DT, but a sharper subject.
I wonder if all the wavelet settings i applied in RT are being somehow bypassed when exporting to tif.