Unable to select thin vertical line in map and background layer

I am unable to select a thin line that I drew using the polygon tool. The line was drawn with no problem but once I tried to select and move it, I was unable to. Left-clicking and dragging a box around to select it does nothing.The problem appears to be limited to vertical, grid-snapped lines with the 'thin' weight, as well as vertical portions of circles with the 'thin' setting for weight. I am running the latest version of Google Chrome, if that is of any help in diagnosing the problem. The map I encountered the issue was rather large, so im not sure if that has something to do with it. I would appreciate the help in getting this sorted.

Hi Liam D. , thank you for the report. The Dev Team is aware of this issue and, as a workaround , recommends using a thicker line weight for your drawings until this issue can be fixed.