Lines are changing their length on Power BI startup

Following on from a question I asked on the forums, I thought I'd report this as a bug: http://community.powerbi.com/t5/Desktop/Lines-are-changing-their-length-on-Power-BI-startup/m-p/356041#M160384

Basically, I am trying to vertically partition data with lines. Normally I would expect the first image posted below.

However, when I re-load PowerBI (same saved file for sure, I tested that a few times), the vertical lines will appear like the second picture.

Additionally, when I first try to drag the lines into the right place (see picture 3 for the attempt), after 'unclicking' when adjusted, the line will pop further back than I placed it. E.g. when you drag a line, you can see the faded line in the new position before sunclicking it. In the case of picture 4, it ends up further up despite resizing to meet the horizontal line.

1.  Ideal situation

2. What I see on start up 

3. Attempting to rezise line to meet horizontal line

4. Result of resizing this same line even when the placeholder line meets the horizontal bottom line