Q1: Yes and No.
When you see an error in SM58, there will be a corresponding entry in ARFCSSTATE.
The other way around for you next question as a part of Q1. Once SM58 is processed, the entry will be deleted from ARFCSSTATE
Q2: It might not be related to WP. It might be because the background job that processes tRFC entries has not run. Once the same runs, you should see the entries from SM58 cleared.
Thanks,
Vikram.M