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This is a common problem that people run into so don't worry about it :)What's going on is that you probably forgot to line up the edges with the same color center/position the corners before using the algorithm to solve them, so they were "solved" into the wrong spot. The video I gave a link to explains how to avoid that a little more clearly.
If the link doesn't work you can also copy and paste it into a new browser window.
If you are still stuck after this instructable, try this video tutorial https://youtu.be/nInGsSmjeds
This is a good tutorial, but not for beginners.If you are brand new to the Rubik's Cube, try this link. https://youtu.be/nInGsSmjeds
Good steps, but poor explanation.Try this video. It's my personal favorite tutorial. https://youtu.be/nInGsSmjeds