Using the Avro Phonetic keyboard layout I can not write 'shrI' in Ekushey Punarbhaba font.
Though I can write it using Ekushey Puja or other font. It seems to be problem of the Punarbhaba font itself. Because if I change the font to Puja after writing, it changes from 'shI' to 'shrI'!
Here is how to reproduce:
* Start MS Word,
* Change Avro keyboard to Phonetic,
* Chnage active font to 'Ekushey Punarbhaba' in MS Word,
* Type: shrI
You should now see:

But what you see is:

* Now select the word 'shI' and change the font to 'Ekushey Puja' and you should see:




