Hi,
The float elements in the database are stored with the format " DECIMAL(12,5) " which mean that only five decimals are stored in the database.
You can see to modify it directly in your table structure if you want more precision ; but by default in the table definition, it is 5.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.