Lost control - Redo/Undo

Weird and unexpected results in editing and drawing paths.
I’m testing Version 2 (683) while running Undo & Redo commands; the results are not synched and the window displays never-drawn paths; in both {Undo} and forward {Redo} steps.
Font settings are based on Grid Spacing =40 and Subdivisions =8.

Can you reproduce this? if so, could you do a screencast if the problem?