copy paste bug

The PDF was created on the same computer by Print->Save as PDF. It is not a scan of a paper version.

I recognized now, that any word containing "ti" (like station, foundation, tight etc) are affected.

Edit: do you, please, observe the same? I have it on two macs.

Look in Keyboard System Preferences, Text and see if you have a text substitution entry for ti to P

I do not have this problem.  Standard troubleshooting things to try include testing whether this behavior occurs in another user account, e.g., Guest, or after starting up in Safe Mode.  

Thanks,

I had there just st.C to be replaced with ℃

But even when I deleted this entry, no help.

When I open the same PDF file in Safari, Copy & Paste works OK.

Now I downloaded some PDF (a meteo station manual) from the web and opened it in Preview. All works correctly.

Only when I Print/Save as PDF from Pages and then open it in Preview, bug is there, otherwise not.