This problem sounds suspiciously like the following upstream bug report:
Bug #623630 - Move logical partition to right yields invalid partition table on 
/dev/sda -- wrong signature 0
https://bugzilla.gnome.org/show_bug.cgi?id=623630

In the upstream bug report, the Extended Boot Record was overwritten
when the partition was moved and this caused the invalid partition
table.

The upstream bug was fixed with GParted version 0.6.2.


** Bug watch added: GNOME Bug Tracker #623630
   https://bugzilla.gnome.org/show_bug.cgi?id=623630

-- 
GParted destroyed my partition table: "Invalid partition table on /dev/sda -- 
wrong signature 0."
https://bugs.launchpad.net/bugs/434463
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