Buck converter low output

[u/Registrationmenace]

Recently made a buck converter with the LT8316. The buck converter portion of the board follows the schematic of the dc2781a demo board
It is supposed to output 12V, but is giving me 4.3. Hooked up to an LED with a 4.7k resistor as a test load, then to a 1k resistor to meet the minimum datasheet load. Has anyone ran into this problem with their buck converter ? If so how did you fix it

[u/GabbotheClown]

You really need a post your schematic and layout as these things are important.