Hello, try to disable your wow addons, you can also try to enable "use lua to move" in advanced general settings. If your problem is not resolve you can try to:
Close WRobot.
Go to folder "WRobot\Settings\"
Open with notepad file "General-PLAYERNAME.SERVERNAME.xml"
Search "<FlyAboveGroundHeight>1.5</FlyAboveGroundHeight>" and replace 1.5 by bigger value.
Save and relaunch WRobot.
(you can also run this c# command if you don't want to edit xml file: wManager.wManagerSetting.CurrentSetting.FlyAboveGroundHeight = 1.5f; )