The light from your flash may be too blue.
This may be more noticeable when using fill flash.
Your camera may have a white balance setting for flash.
Look for a lightning-bolt icon.
You can also tape an amber colored filter onto the flash.
Use the Rosco Cinegel 3409 (Roscosun 1/4 CTO), which warms the light by 1000K.
Or, use the less strong Rosco Cinegel 3410 (Roscosun 1/8 CTO), which warms the light by 600K.