What version of WoW are you playing? Form IDs are different between classic and retail.
On retail, bear is 1 and cat is 2; travel is 3.
On anything older than Warlords, cat is 3 and aquatic is 2.
If you expect the macro to only cast one spell, you should put the spells on one line, otherwise the game is attempting each line every time. You should also use help instead of exists to avoid attempting to cast on enemies.
/cast [stealth] Ravage; [form:1] Maul; [form:2/3] Claw; [@mouseover,help,nodead][] Regrowth
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