When you accidentally drop your ukulele, several things could contribute to the weird sound and excessive vibration you're experiencing:
Structural damage: The impact from the fall could have caused structural damage to the ukulele, such as cracks or misalignments in the body, neck, or bracing. This can affect the overall sound quality and stability of the instrument.
Loose components: The drop might have caused certain components, such as the tuning pegs or bridge, to become loose. Loose components can lead to vibrations that interfere with the normal resonance of the ukulele, resulting in an off sound.
String issues: Check the strings to ensure they are properly attached and not damaged. The impact could have caused the strings to become loose or even break. Loose or damaged strings can affect the tension and tuning stability, leading to a strange sound.
Neck misalignment: If the neck of the ukulele has been affected by the fall, it may have become misaligned or bent. This can cause buzzing or uneven string height, leading to an abnormal sound when you strum.
To diagnose the exact issue and determine the appropriate solution, it's best to take your ukulele to a professional luthier or instrument technician. They have the expertise to inspect the instrument thoroughly, identify the problem, and make any necessary repairs. Attempting to fix it yourself without proper knowledge and tools may worsen the issue.