DOI is not displayed on article published page

Hello @asmecher,
We have recently taken Crossref membership and assigned a prefix 10.69857. Earlier we were another Crossref members prefix (10.18231) and assigned DOI to 170 published articles. Now, when I have changed prefix in Crossref Export Plugin, no DOI is being shown in those 170 published articles. Data of all those 170 articles is already depositted to Crossref and they have transferred ownership of these articles also. However, DOI link is missing from published article page and crossmark button is not showing anything.

We are currently using OJS 3.2.0.3 and www.japtronline.com is the website address for your kind information.

Kindly help me to take measures to show these DOI on the website and make crossmark button active