[phenixbb] Alternate conformation occupancies sum more than 1

Hello, I was refining the 1.2 A structure. After refining occupancies there are several residues with alternate conformers for which the sum of the occupancies is greater than one. For example: GLY A 197 O Occupancy sums to 1.14 MET B 17 CB Occupancy sums to 1.03 TYR B 142 CD1 Occupancy sums to 1.04 TYR B 142 CZ Occupancy sums to 1.01 GLY B 197 O Occupancy sums to 1.23 The density is defined nicely for them, do you know what can be the problem of why the sum could be more than 1? Thank you Mikalai