Sounds like you have a case sensitive collation on that server.  I suggest
always using the actual case and not creating your own punctuation for these
objects, for exactly this reason.

Also, I strongly recommend getting out of the bad habit of writing old-style
joins.  The proper, more modern, more standard, and more readable query
would be:

SELECT COUNT(*)
FROM msdb.dbo.sysjobs j
INNER JOIN msdb.dbo.sysjobschedules s
ON j.job_id = s.job_id
WHERE j.enabled = 1;