What causes someone to suddenly make word and spelling errors despite knowing better?

Question

For example, “eyedea” instead of “idea”
There, they’re, and their.
Your and you’re, etc.

In: Biology

Answer 1

It can be a form of dyslexia. Sometimes dyslexics get opposites confused (left/right, up/down). This can apply to their/they’re, your/you’re and so on.