GUI sliders in Minecraft don't match with settings in options.txt anymore. When you specify values in options.txt, you won't get the same values in Minecraft.
You can see in the pictures.
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Please always check the "Resolution" and not the "Status". The report was closed as "Awaiting Response".
Relates to MC-225252.
I don't know exactly when it happened, but I feel like it is resolved now. When you set the value in options it displays the percentage value correctly, like 0.65 is 65% and not 64%. It doesn't round the value, like if you set 0.599, it would not display 60% in game, but rounding is not the point 0.599 is still 59%, so it's correct. You can maybe check if it's not just me, but I feel like it's working correctly now again.
Did you edit the values while the game was running?