bug in B2 pawn

hello!

sometimes I try to move the pawn B2 to B4, but the machine moves the pawn to B3 !!!

I´ts a bug??? or are they some rules that I does´nt know ???

sorry for my horrible Inglish ... does´n write very well...

your english is much better than some residents here!  thank you!

what browser are you using?  internet explorer? 

show me an example game where this happened?

i use Mac´s Safari (Version 3.0.4 (523.12))

generally, at the end of the game my withe pawn B2 can´t be moved to B3. At first i assume that the error was of my mouse, but it occurs frecuently...

I´ll try to send some example in picture or video.

thanks!!!

sorry... the problem is when i try to move white pawn B2 to B4...

more info needed...