Setting multiple keywords with multiple locations will cause the system to search the set number of those keywords in each location separately. For example: If you set 3 keyword, 4 location and 2 terms, this means Repwarn will search those 3 keywords separately in each location and separately for each term. This means the request will be 24 (3x4x2=24) however Repwarn has a 15 limit, so the combination can not be more than 15.
A good workaround would be to create multiple Lead Generations with specific locations in each, rather than every location in one Lead Generation. That way you will stay under the 15 limit.