Tetrazole pKa problem

I am getting very different answers for a tetrazole pKa depending on which neutral tautomer is specified:

> cxcalc pKa "c1[nH]nnn1"

id    apKa1    apKa2    bpKa1    bpKa2    atoms
1    4.81        -0.85    -5.53    2,5,3

> cxcalc pKa "c1n[nH]nn1"

id    apKa1    apKa2    bpKa1    bpKa2    atoms
1    7.34        -1.52    -4.32    3,4,2

So the 1H tautomer is predicted at 4.81, which is about right, but the 2H tautomer is predicted at 7.3, which is clearly very wrong.  Looks like a bug to me, unless I'm doing something stupid....

Thanks,

Paul

Fixed.

The fix will be available in the next patch release.

Wow, quick response!  Thanks, look forward to testing....

Hi Paul, 

I've tested this issue and the fix will be available in version 16.10.31 the next week. 

Daniel