I just called about the same issue. The customer service representative said that the behavior is normal and expected. After 8 months in their system, our comic submissions will vanish from view. I thought it was supposed to be 8 months after they ship it back, but no, it is 8 months regardless of what stage it is at. She said that I should have been recording my submission numbers, and then I can manually search that way. After some stunned silence, I asked her to provide my submission number, which did not work to locate my submission since it is with CCS first for a quick press before going to CGC.
The "quick press" wait is at 11 months currently, so after the first 8 months of waiting, the order will disappear, and we are supposed to manually search by order number after that. So wacky!!