custom Membership fields disappearing?

I have added a custom profi开发者_运维问答le field named 'Relatiecode' to my user profile according to the SDN developer guide. I have entered a value via the sitecore User Manager. More specifically, I set it to '0000008' for the user extranet\coordinator8, and 0000001 for the user extranet\coordinator1, like this:

I have verified that this is also stored in the sql database

however, when I attempt to access the data in my asp.Net webform (sublayout, actually), the field appears to be empty for user 'coordinator8'. What really confuses me is that it seems to be working perfectly for user 'coordinator1'. See below:

I'm at a loss! What am I doing wrong? Thoughts?

sitecore version 6.5

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Not the solution, but because of deadlines I decided to go with a makeshift solution... we're storing the fields in a custom SQL database now, and querying it with NHibernate.