Library of Zoltun Tomes bug [Recuring]

Library of Zoltun Tomes, i have 5 tomes collected after weeks of picking up lost pages but found out there is a bug stopping me from using it as im told to collect more lost pages when i already have 5 full tomes ready to be used. Im also unable to pick up any more lost pages as it seems 5 tomes is the cap at the moment, pls help as all these tomes are useful