My pcb design uses texts in the proportional font, but when I export to gerbers they have the texts in the vector font
Well, proportional fonts are not the best choice.
Because proportional fonts have many special edges which cannot be clearly converted with high quality.
You must at least convert to a vector format such as HPGL.
https://en.wikipedia.org/wiki/HP-GL
Even this old format will already help.
Also, the plotters in the production rather love HPGL, the newer versions of that, ok.
Eagle has ULPs which you can convert into the vector format.
In the Panel - Option - User Interface - there is a checkbox that you must activate.
Then in the PCB Editor you must in the menu option: "imprint into this drawing", if you already have different fonts in the drawing.
You can also change the text to Vector with Change, or just rewrite the text in Vector.
The same applies to the part names and pin numbers, if you want to write them on the board.
Grüße
Gerald
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