Tooltip not working..

It's working on the VS2022.
When I place my curcor on the any variables, Resharper show it's information like above image,
But it's not working normally on VS2015

tooltip exist without any content like above image.
I tried reinstall resharper, delete caches, but still not working.
Do I have to check other option??
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Hello,
We'll check that, what R# version are you using? Filed https://youtrack.jetbrains.com/issue/RSRP-501703/Tooltips-not-working-in-VS2015.
In the meantime, you can probably disable “Replace Visual Studio tooltips” in “Options | Code Editing | C/C++ | General” to use tooltips from IntelliSense.