I worked for UPS for 6 months back in 1995. I left on good terms and trying to apply for a job online I was surprised to see that I'm not eligible for rehire. 
I put in my notice, my blue shirt and manager knew I was leaving, the scan girls attacked me with their markers on my last day and I was told I was eligible for rehire. So a bit confused as to why the situation would change. I was curious if there were any things to check before contacting the company or proper way to go about finding out why my status changed? I worked at the Walnut Hill facility in Dallas, Texas and paid union dues while I was working there.
Thanks in advance for any help.

I put in my notice, my blue shirt and manager knew I was leaving, the scan girls attacked me with their markers on my last day and I was told I was eligible for rehire. So a bit confused as to why the situation would change. I was curious if there were any things to check before contacting the company or proper way to go about finding out why my status changed? I worked at the Walnut Hill facility in Dallas, Texas and paid union dues while I was working there.
Thanks in advance for any help.