EP Rejected

Hello,

A bit lost and confused with my EP application.
Heres the rundown:

Accepted an offer with our Sg office (work for the USA office of the same company).
S$10,500 monthly salary.
Technical Manager.
No Degree.
12 years of experience in the field with continued growth in salary.
5 years with the US office. The rest were freelance work in the same industry.
Sg office has a good track record and been in business for 30 years.
SAT showed good results for both EP and S-Pass.

Here's the issue:

Employer applied for EP on Jan 23.
EP rejected today, Mar 1.

I found out through the MOM e-service.
No reason was given. (I assume it wouldn't say it here regardless?).
I called the Sg office and they said they will start looking into it.

The glaring question from the get-go was my lack of education being a factor for not getting an EP but there is no school for my kind of work, its very niche.

Also, I did notice that the job was posted on jobsbank on Jan 30 and expired today.
I don't know what else could be the issue.

Any advice?