Help & troubleshooting for channels on your Roku device, including adding/removing channels, logging in to, authenticating, or activating a channel, channel-specific playback issues, assistance contacting channel publishers to report issues, and adjusting channel-specific settings.
Episodes not really missing, just kind of mislabeled and misplaced in the Episode listings when watching on the Roku Channel. They are all there, just a bit jumbled. You can use this link for reference in order to watch them in their proper order/ air dates. (https://en.wikipedia.org/wiki/List_of_Rookie_Blue_episodes)
"Season 5: Episodes 14,15,18,19 are missing" - Season 5 only had 11 episodes. So really episodes 12 and 13 are really Season 6, episodes 1 and 2. Episode 16 and 17 is really Season 6, episodes 5 and 6. Episode 20 is really Season 6, episode 9.
"Season 6: Episodes 1,2,5,6,9 are missing" - As you can see, these aren't missing, they are just wrongly listed under Season 5 and playing out of order. The episodes under Season 6 are completely out of order but using the above Wikipedia article, can see they are at least all there.