RBK852 Block Sites problem

I have an RBK852 router set. When using the Block Sites feature, I encountered an issue. The details are as follows:

In Advance->Security->Block Sites, set: Keyword Blocking: Always Type keyword or domain name here: input finder.video.qq.com, then click Add keyword
Open cmd.exe, run the command:

nslookup finder.video.qq.com

nslookup video.baidu.com

Delete domain finder.video.qq.com and find that both finder.video.qq.com and video.baidu.com are unblocked.

Expected result: Only block finder.video.qq.com

Actual result: Blocks all domains containing "video"

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Firmware Version
V7.2.6.31_5.0.24

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