Welcome in the forum.
See the documentation of the I/O pin component. To maintain the logic level the maximum current is 4 to 20mA, the limitation for you will be the total IO current which is max 200mA. All "8" and a dot might be more than that.
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Crisanto, try setting output pins to "resistive pull up" or "resistive pull down" (depending on your configuration) to limit the current by using internal resistors (~5K).
Thanks for your reply.
As the chip did not heat I wondered was the real impact on the uC.
Perhaps this "bad behavior" is not significant in time.
With the pull-up is not seen practically :-(.
For security I will have to rebuild the PCB with Pull-UP resistors.