Adobe InDesign CC Version 2017.1
Typing letters "fl" in a word in swedish will leave two blanks! How to fix that?
Running Win10 Creators...
I tried to look at the issue you are facing.
According to me this is an issue related to how the InDesign incorrectly maps and reads the glyphs of the font Helvetica (used in your document). With CC 2017.1(infact from CC 2015) InDesign maps the characters "fl" to a glyph which visually looks like a space. When "fl" are written together they are treated as a ligature. InDesign however is unable to read the correct ligature glyph "fl" from the font file.
This was not the case with InDesign CC 2014 where i am able to write "fl" close together and see them substituted by their ligature glyphs(see attached screesnhot)
As a workaround for now, please turn off "Contextual Alternatives" property from the character panel and then you would see "fl" display correctly.
I see this issue in all languages.