THESE ARE NOT WATER VAPOUR TRAILS!

I have been an aviation enthusiast for 47 years..... I have been connected on and off to the aviation industry all my adult life. I was an avid 'plane spotter' since the age of 10 and used to watch/track/listen to 'High Flyers' ..... overhead high flying aircraft.
I know what comes out the back of plane engines looks like but for the past 25 years or do IT'S NOT been normal 'vapour trails' that I witness