Hi,
Yes, there is a known issue when you are mixing the types for the characteristic selectors (dropdown + radio).
We have already a patch for the next HikaShop release to fix that problem ; release which should be available soon (we are in test phase).
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.