Hello,

It should be a javascript conflict.

In the page with problem, you have a javascript conflict with Joomsport javascript. In the second page without problem, the javascript conflict is not present.

Find the origin of the conflict is not easy but with time, it's possible : in Joomla BE, try to deactivate all of your plugins and check if the problem is always present :
-  if the problem has disapeared, the origin of the problem is one plugin.
    reactivate half of your plugin check again the result in order to find the faulty plugin.
-  if the problem is always present, try to do the same treatment with Joomla modules (deactivate them) and check the result.
-  if the problem is not in plugin and in module, try to temporarily change your template in order to see if the conflict is not one javascript of your template.

It's a long treatment but I don't know other method to find the origin of the problem.

Jojo