In latest git, refiling a region seems to set tags. Since you don't want that, you ^G. Then you are left with a duplicate set of entries in the target location. It is intermittent and goes away when you edebug or select a default location using ido.
Maybe this code is related: ;; We don't use ARG and JUST-ALIGN here these args are not ;; useful when looping over headlines `(org-set-tags) Also note the ` . Thanks. Samuel -- The Kafka Pandemic: http://thekafkapandemic.blogspot.com