Samples pan to hard left on one to three keys in bass range

Hi all,

Not sure is upgrading to Win10 caused this or that I just ran into this for a first time, however, some of my imported samples have a range of 1 to 3 keys below the central C that have a big pan to usually the left side. This can be very inconvenient when sampling a bass as the issue occurs in the typical bass range.

Any thoughts?