something interesting??

Using the normal betfair screen with 3 software programs I have noticed on numerous occasion in the past that money is waiting on betfair to be matched that does not appear on any of the software I use.
It has notihing to do with the refresh rate.Right now I,m looking at the 10am Mahindra football match at the over4.5 market.For the last 20 minutes an amount of £83 has been sitting at 1.16 and has now moved to 1.15 .This does not show up on betangel, griuss or my own software
I wonder if anyone else has notice this or knows why and how this can happen.
Very curious.