30% for renewed support - is it truth?

tips-and-tricks

#1

Item price is $34

02 Mar 2016 - 6 months renewed support - $23.80 - this is 70%

03 Mar 2016 - 6 months renewed support - $10.20 - this is 30%

The second sale was standalone and can not be extended support with item purchase. Is it usual thing or I missed something?