Roadmap Planner Macro - Marker (and Bar) accuracy incorrect

Have just started to play with the Roadmap Planner macro and have found an issue that I'm not sure whether it is a bug with this functionality or unrelated (also not sure whether it is a known issue), but have found that the accuracy of the placement of markers is almost an inch off between edit and save modes while in weeks mode.

ie:

• Added a marker for 5th October
• Shows up as 28th Sep in preview/saved mode
• Edit the macro and change the marker to ~25th October and save
• Shows up as 5th Oct

Note: The same applies to bars created and moved manually, ie: bars initially created appear fine, but once moved off the starting line they appear to fall in to the same issue.