Do other people have trouble focusing on/counting repeating imagery?

Ok, likely a confusing title but hear me out. It’s like my eyes or brain get lost when counting the amount of certain things. I have to do it multiple times to make sure I’ve counted correctly.

Ok, a test. How many (i)s do you count here?

iiiiiiiiiiiiiiiiiiiiiiiiiiii

For me it feels like I have to convert all brain power to focus on counting correctly. My eyes get lost in the pattern easily and I have to restart.