Old UM (ROS 3.30) strange paypal payment is thousands euro

I’m configuring Hotspot and UM on a 411AR hardware.

I configured 1 subscriber with this credits:

Name Time Full Price (EUR) Extended Price (EUR)
30minuti 10m 1.00 unavailable
Mensile 4w:2d 23.90 unavailable
Trimestrale 12w:6d 59.00 unavailable
settimanale 1w 8.00 unavailable

I configured 1 test user

when i go to test credit buying
I tryed to buy the 1 euro credit.
when paypal page opens automatically … I found a big surprise..

42949672.95 EUR PAYPAL TRANSACTION !!!

this is reported on timed out payments:

ID Created Price Credit Time Status
1 27-Dec-2009 18:25:35 42949672.95 EUR 1m Timeout
2 27-Dec-2009 19:32:19 42949672.95 EUR 10m Timeout
3 27-Dec-2009 19:35:34 42949672.95 10m Timeout
4 27-Dec-2009 20:05:21 42949672.95 EUR 10m Timeout

Any Idea?!?!

Please, contact support department (support@mikrotik.com) with the attached support output file,
http://wiki.mikrotik.com/wiki/Support_Output_File