Index: /trunk/src/org/openstreetmap/josm/gui/tagging/presets/items/Check.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/gui/tagging/presets/items/Check.java	(revision 12901)
+++ /trunk/src/org/openstreetmap/josm/gui/tagging/presets/items/Check.java	(revision 12902)
@@ -85,5 +85,5 @@
         check.setState(check.getState()); // to update the tooltip text
 
-        p.add(check, GBC.eol().fill(GBC.HORIZONTAL));
+        p.add(check, GBC.eol()); // Do not fill, see #15104
         return true;
     }