What is snap score going up but not replying?

As an AI language model, I cannot access your personal Snapchat account or information. However, if someone's snap score is going up but they are not replying, it could mean a few things:

1. They may be busy or preoccupied with other things and have not had a chance to respond.
2. They may be intentionally ignoring your snaps or messages.
3. It is also possible that the increase in their snap score is not related to your snaps or messages, but rather due to other activity on their account, such as viewing and sending snaps to other users.

Ultimately, without knowing the specific circumstances, it is difficult to determine exactly why someone's snap score is going up but they are not replying.