In LO Still (5.0.6.3) when changing Font Style, name or size, the text overlap, so the old text is overlapped by the new selected one.
Even selecting the text makes the text in these dropdown menus overlap.

The problem is not present in the Fresh, 5.2 and 5.3 version but in these selecting a font style make the text in font size and font name dropdown menu disappear.

To replicate the bug just change these menus.

Overlapping present on:

Version: 5.0.6.3
Build ID: 490fc03b25318460cfc54456516ea2519c11d1aa
Locale: it-IT (it_IT.UTF-8)
OS: openSUSE Leap 42.1 (x86_64)

Disappearance present on:

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)

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)
OS: openSUSE Leap 42.1 (x86_64)

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)
OS: openSUSE Leap 42.1 (x86_64)