How not to set up your DNS (part 1)
Presented in illustrations:
; dig +short ns harvest.idv.tw. harvest.idv.tw. www.harvest.idv.tw. ; dig +short a harvest.idv.tw. 18.104.22.168 ; dig +short a www.harvest.idv.tw. 22.214.171.124
To those setting up nameservers: when people said 'have two nameservers', they did not mean 'and feel free to give them the same IP address'.
As a bonus, harvest.idv.tw has probably doubled the amount of time many DNS servers take to give up on them when 126.96.36.199 is having a wee problem.