Thank you Sonofcy for wanting to help me with this, admittedly, I'm quite a novice at this and trying to figure this all out.
Yes, I did read that the MOSI pin can be defined as anything, and in my case I set it as 11. The ESP32-S3-Dev pin reference under SPI, also mentions MOSI pin is 11.
Do you think that is the issue why the text does persist after it's been updated?