Also, sent numbers could be lower than expected because people you zapped might be using a lightning address that does not support zaps. In that case they receive the sats, but no zap receipt is broadcast to relays. 

I did a quick check on your zaps received and they seem legit at a quick glance. Top 50 zaps received total comes out to 182k sats and you’ve received over 2k zaps. Top zap came from nostr:npub1qny3tkh0acurzla8x3zy4nhrjz5zd8l9sy9jys09umwng00manysew95gx on this note:

nostr:note1dm5tmuzpfv5jjyf2hvtwchs50kqeuj2tc3zwfm2ccd0gkfwmyjvqcmp78e