I've had this problem ever since I installed Windows 10 many months ago. Chrome is set as the default browser. If I open it and pin it to the task bar, after a while it'll start opening a new instance of Chrome (it takes up an additional slot on the task bar as shown below).

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Sometimes, Chrome will tell me that it's not the default browser. Even though it clearly is. Windows will show 2 apparently different Chromes to select as the default:

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If I go to installed programs, there's only one listing for Chrome.

Additionally, Chrome won't update itself. It'll show that it's out of date and tells me to download it manually.

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I've done so each time, but these issues persist. Any ideas?