Logitech M185 Faq page 36

 +Mouse double-clicks when clicked once
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My mouse has been double-clicking from the first day of usage
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My mouse has been working fine until recently and now it's double-clicking
If your mouse double-clicked from the first day of usage, check the Windows setting called
Single-click to open an item. This option makes a single mouse click act as a double click.
Disable this setting to return the mouse to the standard one click option.
To disable, first select your operating system:
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Disabling the single-click to open option in Windows 8/Windows 10
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Disabling the Single-Click to open option in Windows 7/Vista
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Disabling the Single-Click to open option in Windows XP
Disabling the single-click to open option in Windows 8/Windows 10