Using hashtags has been shown to increase engagements on social media posts. Ripl uses hashtag predicting software that suggests hashtags based on the copy in your post. It is not always 100% accurate, and irrelevant or incorrect hashtags can come up.
It's important to check the caption on the final share screen for your post to ensure the hashtags are relevant. You can delete any suggested hashtags and/or add your own.
You also have the ability to turn off the hashtag suggester. To do that tap the Ripl Menu in the top left corner of the home screen, then tap "Account Settings." At the bottom you'll see "Include Hashtag Suggestions." Tap that switch to toggle the feature on or off.