Yeah, something seems to be off with the lines "Type", "# dice thrown/maximum level" and "Dice size/minimum level". I'll try to reproduce the issue. Can you provide a step-by-step repro or does it happen with any SPL resource?
It is not problem for dice field only, and after testing it seems problem may not be in the copy of values but in the input when certain row is selected and then is opened another effect the value from previously selected row suddenly appears in the current selected row. That means simple clicking and selecting spell effect row while browse spell effects can mess values.
Video:
/Edit: I could not reproduce this bug in previous version Version 2.1-20210123