Yesterday you stated in another thread you started that your meter was broken, and got the advice to use an external meter.
Yes, working with a broken meter (correct film speed setting not working) will affect picture quality if you use the reading your meter gives.
In case(!) the built-in meter would work correctly aside of a mechanical stop at the 25 level (which should be the lowest one anyway) you could corect the reading your meter gives for the true speed of your film.
However your posts so far showed that you lack quite a bit of basic knowledge on anologue photography.
I advise to get some second hand text books and give them a thorough reading.