i can not find it in the script and i got it not installed so i can not say it for sure
does the level name ends with 1/2 ?? and a other level as 2/2 ?
try to remove the last /2 from the url and see if the page then works
from the quick look it dit at the script does it seems that the urls are written that way and has nothing to do with rewriting so you can not change that eather (code of what i found )
Code:
$replacements = array($path, $path."/adopt", $path."/level", ...
if that last does not work , then we need to wait on the developer to provide a solution
Greetings From PowerChaos
edit
seems that the /2 is counted as level
so if your pet name already contains a / then it will not work ( as the / got a other value )
to fix that part then then you manual need to rename the pet in the database , and then it can work again
Greetings From PowerChaos