It's not so much remembering a word and how it's spelt.
When I see a word or words written down I spell them in my head, the words are usually shop names, street names, town/city names, business names etc. I will be in the car and see the name of a company on the side of a van and be repeatedly spelling the name in my head until I see a different word, then I'll be spelling that one instead. And it's not usually the whole word. If it's a few words and they have capital letters than I'll be repeating the capital letters.
For example, if I see 'Howes' I will be spelling out 'Howes' in my head. If I see 'E J Howes' I will be spelling 'E J H' in my head.
It is very annoying especially since I can't stop doing it even when I have a headache 