Hi
It's not a big problem. It is visual perception imaginations. That's all.
Our 5 senses are directly connected to sensory as well as short term memory for perception or sensation.
But when you recollect the memories of perceived signals or perceptions or imaginations, it comes from long term memory as all the perceived matters are kept there.
You are recollecting the words with intense imaginations. So that there is a small visual hallucination.
Please check with a clinical or therapeutic psychologist or psychiatrist
Next Steps
Learn to de-verbalize words and learn bryal alphabet communication. it will let you understand words are just strokes or symbols.
Health Tips
listen anything with virtual images than knowing everything