Index: lams_central/web/css/bootstrap/_button-group.scss
===================================================================
diff -u -rb7c92dbcfdb0469dbc0144190a201757f398e529 -ra90d0744dd0d09d1b04869e61ce1b66bf1ee3242
--- lams_central/web/css/bootstrap/_button-group.scss	(.../_button-group.scss)	(revision b7c92dbcfdb0469dbc0144190a201757f398e529)
+++ lams_central/web/css/bootstrap/_button-group.scss	(.../_button-group.scss)	(revision a90d0744dd0d09d1b04869e61ce1b66bf1ee3242)
@@ -37,7 +37,7 @@
   @include border-radius($btn-border-radius);
 
   // Prevent double borders when buttons are next to each other
-  > .btn:not(:first-child),
+  > :not(.btn-check:first-child) + .btn,
   > .btn-group:not(:first-child) {
     margin-left: -$btn-border-width;
   }