Some people have problems with spelling and some do not. Many get 100% on spelling tests and never show problems until college, btw, when they finally encounter words they do not know.
Here is from one article:
Dyslexia can involve more than just reading problems. Often, it’s associated with difficulties in these areas as well:
Handwriting
Oral language
Math
Motor planning & coordination
Organization
Sequencing
Orientation to time
Focus & attention
Right-left orientation
Spatial perception
Auditory & visual processing
Eye movement control
Memory
