About your blur and export issue:
If you look at your Wavelets levels settings you see that Process: Coarser details levels, excluding level is selected. This is not correct (well it is in certain cases, when dialling in tool settings).
When you are done with the wavelets module you need to set Process to All levels, in all directions. This also influences how stuff is exported, this from RawPedia:
When you export the image only the chosen level will be included in the final image so before exporting, make sure you select All levels, in all directions.
Read all about it right here: Wavelet Level, 4 General tool configuration → The process levels
EDIT What is shown and what can be changed depends on the tools that are active inside the wavelets module.
Just tried this in 5.8 (the old one) as well: Same correct result when setting it to All levels, in all directions result, but Coarser details levels, excluding level is still called Above the level in 5.8.