Apple password verification showing weird characters
That looks like font corruption. I'd run the "standard toolkit"


Fix permissions, Verify &amp; if necessary Repair disk, using Disk Utility.
Reset Home folder permissions &amp; ACLs using OnyX  - Maintenance tab/permissions, tick the box at the top then Execute.
Update to [or re-apply if already up to date] 10.10.5 using the 10.10.5 combo update, not the delta from App Store.