There can be significant temperature differences between cores depending on how "work" is allocated among them. It is not unusual for specific programs to end up having a specific core or cores "favored" when running.
Since the maximum normal operating temperature of the i7-7700HQ is 100°C, and you are running a program that's intended to run the processor ragged, it's no surprise that a core or two will be near to maximum operating temperature.
I would not be worrying one bit. What you need to be looking at is what your temperatures look like under normal usage and loads. I'm willing to bet that they'll be a lot lower.
Brian AKA Bri the Tech Guy (website in my user profile) - Windows 10 Home, 64-Bit, Version 1803, Build 17134
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