Unfortunately this 'strange' trend all started with the tragic murder of Jo Cox on June 16 (blue arrow on chart), before that the GBP was tumbling over Brexit fears, that was because the Brexit voters had the upper hand. It actually showed somewhat of a downtrend. I even wrote a little article about it not long ago. But ever since, the GBP/USD has been gaining quite a lot of strength. As of right now, to my knowledge the Brexit/Bremain vote is neck and neck, but it looks like the markets are quite confident that a Brexit is not going to happen as we can see on the chart below.
|The blue arrow indicates the day of the tragic murder of Jo Cox.|