I have something very similar, which could actually be the same issue.
Technical information
Game version: v 1.21.4
Game world: Beta1
Browser + version: Google Chrome Version 55.0.2883.87 m
Flash Player version: 24,0,0,186
Operating System: Windows 10 Famille, 64 bits, version 1607 (14393.576)
Screen resolution: 1680 x 1050
Account name: ChristobaldusMagnus
Humans or Elves: Elves
Reproducibility: 4/5
Problem description
In my case, the problem is clearly a sorting issue on the "Culture" tab of the "Buildings" dialog, as shown on the following screenshots:
Unlocked cultural buildings list starts on page 8 (instead of 1):
and ends on page 10 (instead of 3):
On page 1 (and all pages until 7) of the list, only still locked cultural buildings appear: