30 times 3 = 90 graphs which means that Excel "thinks' tehre are over 100
"fonts" per graph.
More likely when you made 3 graphs you experimented on that page, Excel may
remember the experiments and copy to new sheets.
My aproach was to take the original 3 graphs and copy to a new file, then
replicate to sheets in new file.
This can happen alot.
One way out is to reevaluate WHY you want 50 sheets with the same Graphs9i
assume different data), but Couldn't you use macros to shift data selections
and have data and graphs on one or two sheets?