Lots of things on a bike move in circles. If you mean it moves when you pedal but does not "catch," so the bike does not move forward then that is a problem with the rear gear cluster. You need to have a mechanic look at it. If that's not what you mean you need to get help in providing a more clear explanation.
I’m happy to help further over the phone at https://www.6ya.com/expert/donald_f2ed37026a3ac881
SOURCE: My daughters mt sport sx
phililisa03-
This problem is caused by improperly adjusted derailers/shifters, the mechanism that move the chain from one gear to the next. It is not uncommon for the derailers to be out of adjustment after sitting unused through the winter. Over time the cables that run between the shifters and the derailers stretch just a bit and the derailers no longer work as well without a little tuning up. Unfortunately, for the novice, adjusting the derailers is frustrating at best. The effort and patience it requires is nothing to take lightly. If you're game for giving it a try, there are a number of websites out there that will provide extensive guidance on the process - just "google" how to adjust bike derailers" and you will find plenty of options. My local bike shop will make adjustments like this for a small set price, around $20 or so - you may have a shop nearby that will do the same.
Hope this helps.
Regards,
DIYpro
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