After creating an XY scatter chart, the points and lines in the chart shift position all by themselves. When the chart is not selected it looks like the series are reversed in order. Then when selecting the chart, the lines shift to where they should be. But as soon as they reach the right positions, the symbols and colors shift around and the lines start shifting again. This is on a Mac running 10.10.5. The LibreOffice version info is below: Version: 4.4.1.2 Build ID: 45e2de17089c24a1fa810c8f975a7171ba4cd432 Locale: en_ I made this video of it happening: https://youtu.be/3tK_iDTu2ZM
Created attachment 126402 [details] spreadsheet with the wonky chart (couldn't reproduce behavior after save) I couldn't reproduce the weird behavior after a save and re-open. Uploading the file anyway.
I once saw this too in an older version (don't remember which one, unfortunately), but couldn't reproduce it again. The version you are using is quite old, in fact already end of life (from 31/12/2015). Please try with a current version of LibreOffice and report back here if you can reproduce the same problem.
No repro in Version: 5.3.0.0.alpha0+ Build ID: 03f576466c9f110fbef8923604908654d59484a6 CPU Threads: 2; OS Version: Mac OS X 10.11.6; UI Render: default; Locale: fr-FR (fr.UTF-8); Calc: group setting as wfm