Unknown following on the Neuron staking page

I created a Neuron and started dissolving in NNS. I then configured every topic by following DFINITY Foundation. Somehow, I got additional unknown following with unspecified topics. See the attached picture, ID 28 is the unknown following.

I tried to unfollow for every topic, and see if it can reset the following. But the unknown following still remains.

Anyone has any suggestions? Thanks!