1988 Volvo 740 OIL LEAK

I had my engine gaskets changed about a year ago because of engine oil leaks and now they have started up again with a vengeance. The leak seems to come from around the dipstick area.

One thing which is strange is that my engine oil dipstick continually is pushed up out of the oil dipstick tube. I checked it and there is a lot of pressure coming from the dipstick oil tube. I have to manually tie down the dipstick to keep it in place. The oil may be spouting from the dipstick tube but when idling I don't see it.

Does that give any indication of why it's leaking so badly?

Thanks.