Problem rain total Oregon WMR200 and meteobridge

[lorenz1982]

I have problems with my meteobridge on an MR3020 and station Oregon Scientific WMR200.
During the last three rainfall has lost every time about 1mm than marked by the display of the console.
Even the last time:
2.1 mm marked by the station, but only 1mm reported by meteobridge in its internal menu.
It is as if he lost the first shot of the rain gauge.
The first few times it worked well, it's maybe a problem of the last firmware?