webalizer only updating stats for 38 days

I have a problem with webalizer stats, not sure if appropriate here but I thought I would ask here ;o)

I moved the web site onto a new server using replicate.

on last server this is what I got: http://happygolf.co.uk/stats_view2013/

but now I get:

http://happygolf.co.uk/stats_view/

I have checked but I can't see anything out of the ordinary as to why the previous stats now in beginning of february is dropping off, I see files webalizer.hist and webalizer.current

so I assumed that they would pick up the historical data.

I wondered if anybody had any pointers.

thanks Brian