Excel 16 - Unwanted Extra Worksheet

[MFL100]

Suddenly, when I insert a new sheet in a workbook (Ctrl+N or clicking on + button at bottom of sheet) ,Excel inserts two new sheets, one named Sheet 1(2) and the other Sheet 2.  If I click again, it inserts two more.  See the attachments.  How do I restore Excel's standard one new sheet insertion?  Is a coding change involved?

Thank you.

[#2]

Slight correction - the double new sheets are inserted when I click on Insert in the right click drop down, not Ctrl+N, or click on the + button.

[#3]

@MFL100 

Problem solved by revising the Sheet template.