issue with DB update since the upgrade

[zivski]

hello,

Lately I upgraded from VM 3.2.12 to the latest version, and since then I got an issue with a plugin we developed.
The plugin is a new payment method to a local credit card company.
The shop has a special product "club member"... when a client is buying this product we are updating his profile (VM user, custom fields)... this is done in the beginning of the function 'plgVmConfirmedOrder' in the plugin
We check the database just before return from the function and everything is in place... BUT once the payment page (Iframe) is displayed the DB values return back to the older values...
We didn't find where this "update" is done... anyone can help? ideas?