[Koha] Editing budget amounts resulted in budget disappearing

I had a bunch of 13 budgets set up in Koha 3.0 (test site). I clicked on edit and went into a few 8) to change the $ amount, and upon saving the edited budget the fund no longer displays on the home / acquisitions screen. Where there were 13 funds, now only 5 display. The 8 I edited no longer display. When I click on the manage link to get to home / admin / funds, then click on View all budgets, I can see all 13 budgets, but the start dates ahave been reset to 02/00/0 and no end date is entered. The only change I did was to adjust the $ amounts. Is this a known bug? or have I done something dodgy! cheers Jo.