Field cannot be placed on portal, or only by chance
Operating system version
Description of the issue
Sometimes it is nearly impossible to place a field on a portal. Although the field is entirely placed inside the first row of the portal, it's data will only be shown once, not in each row of the portal as expected. This is the case if if the top/bottom position is equal to a field which works (i.e. which is shown in each row of the portal). After endless ttys of correcting the position, sometimes the field works, sometimes not.
Steps to reproduce the problem
Data is shown in each row of the portal
data is only shown in the first row of the portal.
Exact text of any error message(s) that appear