Different issue to the previous one but vaguely related.

I have charts set up in XL2013 32 bit, I've now got XL2016 64 bit with secondary axis.

When I select a series and click (or press) delete, that series stays but all the others disappear. Doesn't matter which axis they are on.

When I recreate them they are fine but they are all very messy formatting and it will take me days to rebuild them (there are 30)