Two-finger scrolling closes tab unexpectedly

I have been having an issue with using BTT and Chrome: often while scrolling down through a web page using two finger drag, the tab I am viewing will suddenly close, as if I had sent a CMD-W command. This is frustrating....I find I have to go into History to bring back the page I was looking at. I'd say this is happening about 30-50% of the time. It is more likely to happen if I increase the speed of my scroll downwards. It is as if some buffer is being overrun, triggering the unwanted CMD-W command.

Is there some way to tweak BTT to avoid this?

Thanks in advance,
Rob from AZ