Applied Super Visa but got Regular Visa

I applied super visa for my parents on 20 April 2017 with all necessary documents such as medical insurance, 1 year medical examination, income verification (T4, Notice of Assessment), employment letter, 3 months round-trip air tickets, invitation letter, etc. but after 1 month and a half that my parents received regular V1 visa, the process usually take 3 months but it only takes us 1.5 month then what we received are 10 years V1 visitor visa instead of super visa.

From my best understanding, when applying super visa, officer will either refuse and return the application package or approve super visa, but my case is a little bit unusual when we received V1 regular visa instead. Does anyone experience the same situation before or has any idea?

Many thanks