Calc misbehaves. Attached is a spreadsheet. This error can be demonstrated two different ways. 1. Open the spreadsheet. Navigate to the DEC 2017 sheet if necessary. Note the value in cell D27 is $733.81. Add a sheet by pressing the big plus sign just to the left of the MAY 2017 sheet. Now look again at cell D27 on the DEC 2017 sheet. It now reads $1133.91. Now close the spreadsheet without saving. 2. Reopen the spreadsheet. Navigate to the Dec 2017 sheet if necessary. Note the value of cell D2 is $-26.91. Now copy cell D2 with CTRL-C. Note that still reads $-26.92. Now paste with CTRL-V. Now once again you have input no changed values but the amount in cell D27 now reads $1133.91. This phenomena did not happen until I upgraded to LibreOffice 5.4.2.2. My computer is Gigabyte motherboard with Intel i7 and 16 gigabyte RAM running Ubuntu 17.10 64bit.
*** This bug has been marked as a duplicate of bug 114682 ***