Unable to scroll beyond a letter in AD/LDAP

Hello,
I have been playing around with Nagios Fusion free version and was trying to setup AD/LDAP to import users, however, I cant scroll beyond N-letter. There are no further scroll down or 'Next' option to select the next set of users. I have tried multiple browsers, still the same. However, the functionality seems to work smoothly for our production NagiosXI where I can see upto Z-letter users from AD/LDAP.
I am not sure what is the issue here.
I have been playing around with Nagios Fusion free version and was trying to setup AD/LDAP to import users, however, I cant scroll beyond N-letter. There are no further scroll down or 'Next' option to select the next set of users. I have tried multiple browsers, still the same. However, the functionality seems to work smoothly for our production NagiosXI where I can see upto Z-letter users from AD/LDAP.
I am not sure what is the issue here.