Hey I think I may have found a solution!!
In the Google Play Store, if you go to the JW Library App and check more information, there's a bit about how the highlighting problems is a known issue. I attached a screenshot. It seems the problem is being caused by a Chrome update. I uninstalled my Chrome update and it seems to have fixed the problem!
To remove Chrome updates, this is what I did (although steps may differ depending on your device):
-Go to Settings (swipe down from the top of your screen and tap the Gear icon)
-In the list on the left, tap on "Apps"
-In the list on the right, find and tap "Chrome"
-On the top-right there should be "Three Dots" icon. Tap on that and tap "Uninstall updates"
-Tap "Yes" or "Ok" and Chrome will uninstall its updates.
I suppose you can just uninstall Chrome altogether to avoid this. But I use Chrome a lot so I did it this way. Note that your device may still automatically update Chrome, thus causing the JW Library problems to reoccur.
If you want to disable Chrome from automatically updating itself:
-Go to Google Play Store
-In the Search box, search for "Google Chrome"
-Tap on the multicolored wheel icon that represents the Chrome program (it should be the first result in the search)
-On the top-right there should be a "Three Dots" icon. Tap on that and uncheck the box called "Enable auto update"
Now Chrome will not update anymore. Of course, once the brothers fix the problem with JW Library, you may want to re-enable Chrome's auto-updates. In which case, just follow the same steps above and enable the check box "Enable auto update".
Hope this helps!