Playing a druid and in the settings & tools I have "Travel Form" checked for both ground and flying mounts. I do NOT have "use ground mount" checked. On occasion my toon tries to mount both types, flying & ground. Wondering if this has been reported already ? If not what can I provide to help you diagnose the issue Looking for "Mount Up:" you will see that it mounts several random mounts when I am using only the travel form as a Druid. This happens often, but a few examples are at these times 17:17:23.728 18:56:48.261 19:01:13.666