Hello,
Issue is pretty much the tittle, searching any spell lists (cleric, paladin, wizard, etc,...) by level or by name, they all give back just the list of all spells :
I am on chrome browser, latest update, it's been like this for me and my players for months, I have player's handbook and XGTE.
For higher visibility by the team, you should post it under the Wizards of the Coast Bug Report Megathread thread, which is monitored by team members. This particular issue is particularly frustrating and has been reported multiple times over the course of many months. I urge you to report there, as this is a basic function of the compendium, which should be addressed.