User points don't work

-- HikaShop version -- : 2.6.4
-- Joomla version -- : 3.5
-- PHP version -- : 5.5.12

Hi,
I set the user points plugin to my site, and in the check out page, it asked me that I have 100 points for 100 dollars, do I want to use the points? and I chose yes, but it actually didn't use the points. Could you tell me if any of my setting was wrong? Thanks.
attached please find some of my screenshot.
up1.png, up12.png are my setting
up2.png is the check out page
up3.png is the order page

bast regards

Hello,

Your configuration seems to be good, but we can't understand the checkout screenshot that you sent, we can't clearly see the value of the checkout userpoint buttons.
Could you send us a more detailed screenshot and in English if possible ?

Thank you,
Best regards,
Mohamed Thelji.

Hi Mohamed,
Thanks for the reply.
Please see the attachment that I translate the screenshot that I sent.
in 2t.png, it says 100 points could be use.
but in 3t.png it shows no points was applied.
This really confuse me.
By the way, in this case, user have100 points, system didn't ask him how many point to use, so the customer must use up all the points in every purchase when there are points, this is kind of inconvenient.

Thanks in advance
Best regards

Hi Nicolas,
Thanks for the reply.
I fix the previous problem, it works now, but another error occur, please see the attachment.
Issue 1. 1st.png, points discount 500 points but not show in order form.
Issue 2. 2&3.png, User had 500 points, buy product $850, points discount 500 points, but user points still 500 ponits. It should be 0.

Dear Philip:
Sorry! haha! Our url: