Hello my Lord , you posted already this topic ''bug'' here :
https://plarium.com/forum/en/stormfall-age-of-war/50_bug-reports/201330_woers-protection/
but you didn't answered anymore to the moderator there !
Please keep in mind also that , you can't buy a weor protection if you have at least 1 in your inventory , so i invite you to check your items!
And for the second time ,i advice you too, before posting again a bug report , please take a look how should be created a bug report , in that way with all the details we can investigate it !
https://plarium.com/forum/en/stormfall-age-of-war/50_bug-reports/84409_creating-a-bug-report/
I wish you good game and good battles !