In one of three computers the letters in an object box just show symbols.
They all had the same install of office 2016 pro 64 bit using powerpoint.
Now the broken office is office 365 32 bit 2016

I have tried to repair, reinstall, change from office pro 2016 64 bit to office 365 32bit 2016 and change the computer keyboard and language.
Nothing works.

In the broken office 2016 powerpoint slide show


In the correctly working office 2016