The decline in interest rates after the Brexit vote in late June has boosted mortgage originations in recent weeks and caused problems for holders of mortgage servicing rights, according to industry participants at the California Mortgage Bankers Association’s Western Secondary Market Conference in San Francisco this week. Mike Duncan, a hedge manager at Compass Analytics, said 25 percent of his firm’s clients were over capacity at the end of May and 40 percent were over capacity by the end of June. He predicted that over-capacity rates could go even higher if interest rates stay low, increasing demand for refinances. Compass provides pricing, valuation and interest rate risk-management services. Rob Branthover, a managing director at Mortgage Industry Advisory Corp., added...