Because you are Level 8, only you can see the details of your submissions.
About the actual issue you are experiencing - I have discussed with C2C, and we both have experienced that - rather randomly. It doesn't happen enough for us to alert Admin about it, but it is rather peculiar. No rhyme or reason to when it doesn't show. At least, not that I've been able to see.
-- Dan --
Note: Please see my profile for more info regarding trading (section updated 3/4/2024). I have added a large portion of my inventory to the site, and currently have trading turned on (details are in my profile).