Text size A slowdown in house price gains continues as climbing mortgage rates dampen the prior housing increase. Joe Raedle/Getty Images Right after months of thinning gains, dwelling selling prices have at last fallen from 12 months-in the past stages, according to a single regular gauge of knowledge. It could be a indication of what’s to arrive as total-thirty day period indicators—which demonstrate price development from the year prior—catch up.  Traders very last month acquired a slate of December and January house price tag info to digest. The figures, from the National Association of Realtors and S&P Dow Jones Indices, clearly show that selling prices continued to slip thirty day…