This graph shows the percentage of letters you recalled on each of the two tasks. You correctly identified the uppercase letter on {{data.noIntCorrect}} of the first four trials when there was no interference and {{data.intCorrect}} of the second four trials when there was interference.

As you can see, the presence of the lowercase letters distracted you due to interference and kept you from encoding the correct letter.

It seems you were unaffected by the interference of the lowercase letters. Usually, people perform worse on the second set of trials because the distracting, lowercase letters provide interference and reduce the encoding.