Even I have reinstalled the WordPress Core just to make sure if a file was modified at some point.
Thank you @sergem but nothing is working.
Here are the steps I have taken.
Purged Caching
Disabled Caching
Uninstalled and Reinstalled Security & Malware scan by CleanTalk
Deleted database tables created by SPBC still same thing.
@katereji the problem is it is stuck in here and I can’t access the part where I can add the key https://paste.pics/1a63cb51b166809ddf5adab7ae8e4fb4