The letter combination fl does not space in Inkscape. I've set the letter spacing to 30 in the pictured case, and as can be seen the fl in flying is not spacing out. Is this a bug?
Inkscape allows you to turn ligatures off (explanation for what they are is in the post by @user287001)
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1Thanks so much for showing the click Apply part! Ended up being very important :) – Ole Jun 11 at 22:26
This is a guess: fl is a ligature, a special character which contains f and l together.Many fonts have them. I do not try to guess the exact method how you did pick it.
Here's a part of Arial's special characters, in the beginning of the list there's fi and fl
Advanced typesetting software can place ligatures automatically for nice looks instead of separate letters if that's specified in settings, but they also can take them off if there's a forced letter spacing. Inkscape isn't such program although very useful for many purposes.