Hello,
When copying a fill or border, and pasting it to a selection of multiple layers, only 1 of those layers will have the style applied, despite the ui showing that they all have the same style. Toggling the style on and off will change which 1 of has the style applied.
Attaching video to show this issue for borders, but applies to fills as well. This problem has been around for a few sketch versions now, but this video is recorded using 2015.1.3