Product and version
FileMaker Server 126.96.36.1998
FileMaker Pro Advanced 188.8.131.525
OS and version
Mac OS X 10.11.6
Browser and version
My portal shows records from a self-related table. I use Button Bars with calculated Segment labels to show some related data in the portal rows. In FMPro it works fine. In WebDirect the button labels show data from the first record in all portal rows. If the portal shows records from another (not self-related) table, everything works fine.
How to replicate
Open the attached file in WebDirect.
Put the calculated data into a global variable with Conditional Formatting, and show that variable as the button label.