There used to be an issue when sharing a form view that had negative values in a scatterplot.
This issue might have been resolved now.
When trying to work around this issue i stumbled upon another issue:
I made a calculated field that takes the negative of the plotted values (so you end up with positive values in the plot) and that seemed to work just fine.
But after i shared that form, users where reporting byzare behaviour: the plotted values came from a completely different column.
Looking at the issue from one of these users i spotted the problem: the calculated fields that i was using are not shared when sharing the form. Then the view (the scatterplots in this case) silently takes another datafield as its source and displays nonsensical information.