When a value is inserted in Sheet1 and a new sheet is created, the value goes from Sheet1 to the new sheet.
Only the last value inserted or modified goes to the new sheet.
If you deselect the cell where you inserted the value and create a new sheet, the bug doesn't present itself.


STEPS:
*Insert a value in a cell, do not deselect the cell
*Press the + button to create a new sheet

Expected behaviour: the value stays in his cell.

Present on:

Version: 4.4.0.1
Build ID: 1ba9640ddd424f1f535c75bf2b86703770b8cf6f
Locale: it_IT

Version: 5.0.6.3
Build ID: 490fc03b25318460cfc54456516ea2519c11d1aa
Locale: it-IT (it_IT.UTF-8)

Version: 5.1.3.2
Build ID: 644e4637d1d8544fd9f56425bd6cec110e49301b
CPU Threads: 2; OS Version: Linux 4.1; UI Render: default;
Locale: it-IT (it_IT.UTF-8)

Version: 5.2.0.0.beta2
Build ID: ae12e6f168ba39f137fc110174a37c482ce68fa4
CPU Threads: 2; OS Version: Linux 4.1; UI Render: default;
Locale: it-IT (it_IT.UTF-8)

Version: 5.3.0.0.alpha0+
Build ID: a8bd44573b75d1399257d6f5d052611439607189
CPU Threads: 2; OS Version: Linux 4.1; UI Render: default;
TinderBox: Linux-rpm_deb-x86_64@70-TDF, Branch:master, Time: 
2016-06-13_23:46:49
Locale: it-IT (it_IT.UTF-8)

OS:    openSUSE Leap 42.1 (x86_64)