The first thing to check is whether or not the blade your putting on your grinder is indeed broken. If you can see an noticeable cracks or damage, start over with a new blade to ensure to your own safety, then return to work.
If the blade is undamaged, the alignment of the grinding head assembly could be off. Use this troubleshooting guide to quickly assess the issue and get your grinder back up and running!
[[RYOBI P422 TROUBLESHOOTING GUIDE|RYOBI P422 Troubleshooting Guide]]