This is kind of a convoluted issue.
The movie you linked to and are looking for is "Friend Request" starring Alycia Debnam-Carey. (2016) (a.k.a "Unfriend"). I do not see this particular Friend Request (there are about 5 movies with same title) available for free on Roku. You can however find it on the On-Demand for rent or purchase on Amazon Prime Video, Redbox, Netflix, etc. [This particular Friend Request movie is playing correctly on the above].
The movie "Unfriended"(2014) is also a similar online horror/thriller, but distinct movie from Friend Request.
You are correct though that something is wrong with the free offerings of movies titled Unfriend, Unfriended, and Friend Request. They seem to all be going to the same "Friend Request" (2013) movie starring Anthony Michael Hall. (Regardless of watching on Roku Channel, Tubi, Plex, etc)
This happens occasionally when multiple movies have the same title. It never gets fixed quickly and is usually because the CDN provider streaming the movie has it mislabeled. Now sometimes a movie has 2 titles due to the origin of its release. Sometimes when released in the US, it gets a different title. This appears to be case with Friend Request (2016) being released internationally also as Unfriend, Kill a Friend, and Unknown Error (2017) as showing in Roku's Search. This is why Roku is showing a description of "Unfriend" as that of "Friend Request' (2016), but is improperly playing Friend Request (2013).
Roku Community Streaming Expert
Just another Roku user... I am not a Roku employee.
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