Whatever it is the solution is likely the same, return it to the shop for them to look at or strip it down as far as your skills/tools allow and put it back together again.
@snottyotter started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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Whatever it is the solution is likely the same, return it to the shop for them to look at or strip it down as far as your skills/tools allow and put it back together again.