Hyperlinks open startup file in XLSTART as well as desired file

Occasional Visitor

Just loaded Excel 2019. I use a file that opens automatically when I start Excel to open other files I use often. When I click on the link, it seems to start a new Excel and opens the automatic file from XLSTART as well as the desired file. Of course Excel does not like this because it is already opened, and I don't want a second file either. What is different from Excel 2016, or what do I need to change to stop this happening? 

I have looked in Options and cannot find anything to change or that is different than the 2016 version on my other computer.

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