Chinese text is uneven

after my phone glitched out when i was switching keyboard placements around in 2022, my simplified Chinese text shows up to be very uneven and has letters that are written strangely, or some letters appear bolder than others. for non-natives of the language it may be difficult to notice, but it’s very obvious to me. i took my phone to the beijing apple store and they said they didn’t know how to fix it. any help would be much appreciated, thanks! (phone has also since been changed from XR to the 13)