Hello
Yes, it's absolutely normal.
Just having a look at your pic, I can see that your rear sprocket is worn. Compare its teeth to a new one and you'll be convinced.
Try to pull on the chain at the most backward point of the rear sprocket. If you can see more than the half of a sprocket tooth, this means that your chain kit must be changed.
The chain tensioners are at the maximum backward point, this also means that your chain kit is worn.
I've changed mine, on my Classic, after 18000 km. Discussing that with my dealer, he told me that, due to its low size, the Scrambler chain kit will not resist more than 20000 km. On my ST2, the chain kit was a 525 large one, when the Scrambler kit is only a 520, less resistant.