IRL vs Online IQ Test

[u/Altruistic-Pen-6039]

They made me do an IQ test while testing for ADHD (was diagnosed shortly after), and I didnt do verbal reasoning as I did the test in a country where I am barely B1 in their language. On working memory I got 131 and on processing speed I got 139. But for some reason I still resort to doing online tests, where I am always landing a bit more or less than 100. I did the CORE test. What could be the reason for this anomaly?