This is very similar to https://community.sdl.com/product-groups/translationproductivity/f/90/t/9677
Looks like the new option to include existing reports in package, introduced back in Studio 2015 SR2 CU7, is improperly implemented :-\

Clearing the "Include reports in package" checkbox has no effect, Studio just ignores it and behaves like if it's set:

• if the greyed-out radio button is set to "Recompute...", Studio recomputes the stats and then includes the single recomputed report in package
• if the greyed-out radio button is set to "Include existing...", Studio includes all reports existing in the project folder(!) for the target language(s), including completely irrelevant ones like "Apply PerfectMatch", "Translation Count", "Pre-translate", etc.

The above behavior was observed in Studio 2017 CU5 (last pre-SR1 build), but I somehow doubt that any newer builds behave differently.

(The stats recomputing can be best seen with MANY files and LARGE TM... then the package creation takes considerably longer time than it should - and the progress stops in "Adding files" state for way longer than it should - plus the CPU load gets high for that time)

EDIT:The question is, what is actually implemented incorrectly - the behavior, or the GUI?!
Comparing to original functionality (only checkbox for recomputing or not recomputing the stats) it looks like the main problem is badly implemented GUI. And the inclusion of ALL reports instead of only the one relevant report is secondary problem...

Oh, and BTW, the developer also forgot to change the minimal height of the dialog (kept the original height before the new options were added), so the some options can be completely hidden!